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//! HTTP responses. pub(crate) mod handle; pub(crate) use self::handle::handles_to_response; use self::handle::ResponseHandle; use super::body::{self, Body, StreamingBody}; use super::Request; use crate::backend::Backend; use crate::convert::{Borrowable, ToHeaderName, ToHeaderValue, ToStatusCode}; use crate::error::BufferSizeError; use crate::handle::BodyHandle; use crate::limits; use http::header::{HeaderMap, HeaderName, HeaderValue}; use http::{StatusCode, Version}; use mime::Mime; use serde::de::DeserializeOwned; use serde::Serialize; use std::io::BufRead; /// An HTTP response, including body, headers, and status code. /// /// # Sending to the client /// /// Each execution of a Compute@Edge program may send a single response back to the client: /// /// - [`Response::send_to_client()`] /// - [`Response::stream_to_client()`] /// /// If no response is explicitly sent by the program, a default `200 OK` response is sent. /// /// # Creation and conversion /// /// Responses can be created programmatically: /// /// - [`Response::new()`] /// - [`Response::from_body()`] /// - [`Response::from_status()`] /// /// Responses are also returned from backend requests: /// /// - [`Request::send()`] /// - [`Request::send_async()`] /// - [`Request::send_async_streaming()`] /// /// For interoperability with other Rust libraries, [`Response`] can be converted to and from the /// [`http`] crate's [`http::Response`] type using the [`From`][`Response::from()`] and /// [`Into`][`Response::into()`] traits. /// /// # Builder-style methods /// /// [`Response`] can be used as a /// [builder](https://doc.rust-lang.org/1.0.0/style/ownership/builders.html), allowing responses to /// be constructed and used through method chaining. Methods with the `with_` name prefix, such as /// [`with_header()`][`Self::with_header()`], return `Self` to allow chaining. The builder style is /// typically most useful when constructing and using a response in a single expression. For /// example: /// /// ```no_run /// # use fastly::Response; /// Response::new() /// .with_header("my-header", "hello!") /// .with_header("my-other-header", "Здравствуйте!") /// .send_to_client(); /// ``` /// /// # Setter methods /// /// Setter methods, such as [`set_header()`][`Self::set_header()`], are prefixed by `set_`, and can /// be used interchangeably with the builder-style methods, allowing you to mix and match styles /// based on what is most convenient for your program. Setter methods tend to work better than /// builder-style methods when constructing a value involves conditional branches or loops. For /// example: /// /// ```no_run /// # use fastly::Response; /// # let needs_translation = true; /// let mut resp = Response::new().with_header("my-header", "hello!"); /// if needs_translation { /// resp.set_header("my-other-header", "Здравствуйте!"); /// } /// resp.send_to_client(); /// ``` #[derive(Debug)] pub struct Response { version: Version, status: StatusCode, headers: HeaderMap, body: Option<Body>, fastly_metadata: Option<FastlyResponseMetadata>, } impl Response { /// Create a new [`Response`]. /// /// The new response is created with status code `200 OK`, no headers, and an empty body. pub fn new() -> Self { Self { version: Version::HTTP_11, status: StatusCode::OK, headers: HeaderMap::new(), body: None, fastly_metadata: None, } } /// Return whether the response is from a backend request. pub fn is_from_backend(&self) -> bool { self.fastly_metadata.is_some() } /// Make a new response with the same headers, status, and version of this response, but no /// body. /// /// If you also need to clone the response body, use /// [`clone_with_body()`][`Self::clone_with_body()`] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let original = Response::from_body("hello") /// .with_header("hello", "world!") /// .with_status(418); /// let new = original.clone_without_body(); /// assert_eq!(original.get_header("hello"), new.get_header("hello")); /// assert_eq!(original.get_status(), new.get_status()); /// assert_eq!(original.get_version(), new.get_version()); /// assert!(original.has_body()); /// assert!(!new.has_body()); /// ``` pub fn clone_without_body(&self) -> Response { Self { version: self.version, status: self.status, headers: self.headers.clone(), body: None, fastly_metadata: self.fastly_metadata.clone(), } } /// Clone this response by reading in its body, and then writing the same body to the original /// and the cloned response. /// /// This method requires mutable access to this response because reading from and writing to the /// body can involve an HTTP connection. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/clones-body.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut original = Response::from_body("hello") /// .with_header("hello", "world!") /// .with_status(418); /// let mut new = original.clone_with_body(); /// assert_eq!(original.get_header("hello"), new.get_header("hello")); /// assert_eq!(original.get_status(), new.get_status()); /// assert_eq!(original.get_version(), new.get_version()); /// assert_eq!(original.take_body_bytes(), new.take_body_bytes()); /// ``` pub fn clone_with_body(&mut self) -> Response { let mut new_resp = self.clone_without_body(); if self.has_body() { for chunk in self.take_body().read_chunks(4096) { let chunk = chunk.expect("can read body chunk"); new_resp.get_body_mut().write_bytes(&chunk); self.get_body_mut().write_bytes(&chunk); } } new_resp } /// Create a new [`Response`] with the given value as the body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/body-argument.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::from_body("hello"); /// assert_eq!(&resp.into_body_str(), "hello"); /// ``` /// /// ```no_run /// # use fastly::Response; /// let body_bytes: &[u8] = &[1, 2, 3]; /// let resp = Response::from_body(body_bytes); /// assert_eq!(resp.into_body_bytes().as_slice(), body_bytes); /// ``` pub fn from_body(body: impl Into<Body>) -> Self { Self::new().with_body(body) } /// Create a new response with the given status code. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/body-argument.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// use fastly::http::StatusCode; /// let resp = Response::from_status(StatusCode::NOT_FOUND); /// assert_eq!(resp.get_status().as_u16(), 404); /// ``` /// /// ```no_run /// # use fastly::Response; /// use fastly::http::StatusCode; /// let resp = Response::from_status(404); /// assert_eq!(resp.get_status(), StatusCode::NOT_FOUND); /// ``` pub fn from_status(status: impl ToStatusCode) -> Self { Self::new().with_status(status) } /// Builder-style equivalent of [`set_body()`][`Self::set_body()`]. pub fn with_body(mut self, body: impl Into<Body>) -> Self { self.set_body(body); self } /// Returns `true` if this response has a body. pub fn has_body(&self) -> bool { self.body.is_some() } /// Get a mutable reference to the body of this response. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/creates-empty-body.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// use std::io::Write; /// /// let mut resp = Response::from_body("hello,"); /// write!(resp.get_body_mut(), " world!").unwrap(); /// assert_eq!(&resp.into_body_str(), "hello, world!"); /// ``` pub fn get_body_mut(&mut self) -> &mut Body { self.body.get_or_insert_with(|| Body::new()) } /// Get a shared reference to the body of this response if it has one, otherwise return `None`. /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// use std::io::Write; /// /// let mut resp = Response::new(); /// assert!(resp.try_get_body_mut().is_none()); /// /// resp.set_body("hello,"); /// write!(resp.try_get_body_mut().expect("body now exists"), " world!").unwrap(); /// assert_eq!(&resp.into_body_str(), "hello, world!"); /// ``` pub fn try_get_body_mut(&mut self) -> Option<&mut Body> { self.body.as_mut() } /// Get a prefix of this response's body containing up to the given number of bytes. /// /// See [`Body::get_prefix_mut()`] for details. pub fn get_body_prefix_mut(&mut self, length: usize) -> body::Prefix { self.get_body_mut().get_prefix_mut(length) } /// Get a prefix of this response's body as a string containing up to the given number of bytes. /// /// See [`Body::get_prefix_str_mut()`] for details. /// /// # Panics /// /// If the prefix contains invalid UTF-8 bytes, this function will panic. The exception to this /// is if the bytes are invalid because a multi-byte codepoint is cut off by the requested /// prefix length. In this case, the invalid bytes are left off the end of the prefix. /// /// To explicitly handle the possibility of invalid UTF-8 bytes, use /// [`try_get_body_prefix_str_mut()`][`Self::try_get_body_prefix_str_mut()`], which returns an /// error on failure rather than panicking. pub fn get_body_prefix_str_mut(&mut self, length: usize) -> body::PrefixString { self.get_body_mut().get_prefix_str_mut(length) } /// Try to get a prefix of the body as a string containing up to the given number of bytes. /// /// See [`Body::try_get_prefix_str_mut()`] for details. pub fn try_get_body_prefix_str_mut( &mut self, length: usize, ) -> Result<body::PrefixString, std::str::Utf8Error> { self.get_body_mut().try_get_prefix_str_mut(length) } /// Set the given value as the response's body. #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/body-argument.md") )] #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/discards-body.md") )] pub fn set_body(&mut self, body: impl Into<Body>) { self.body = Some(body.into()); } /// Take and return the body from this response. /// /// After calling this method, this response will no longer have a body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/creates-empty-body.md") )] pub fn take_body(&mut self) -> Body { self.body.take().unwrap_or_else(|| Body::new()) } /// Take and return the body from this response if it has one, otherwise return `None`. /// /// After calling this method, this response will no longer have a body. pub fn try_take_body(&mut self) -> Option<Body> { self.body.take() } /// Append another [`Body`] to the body of this response without reading or writing any body /// contents. /// /// If this response does not have a body, the appended body is set as the response's body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/body-append-constant-time.md") )] /// /// This method should be used when combining bodies that have not necessarily been read yet, /// such as a body returned from a backend response. To append contents that are already in /// memory as strings or bytes, use [`get_body_mut()`][`Self::get_body_mut()`] to write the /// contents to the end of the body. /// /// # Examples /// /// ```no_run /// # use fastly::{Request, Response}; /// let mut resp = Response::from_body("hello! backend says: "); /// let backend_resp = Request::get("https://example.com/").send("example_backend").unwrap(); /// resp.append_body(backend_resp.into_body()); /// resp.send_to_client(); /// ``` pub fn append_body(&mut self, other: Body) { if let Some(ref mut body) = &mut self.body { body.append(other); } else { self.body = Some(other); } } /// Consume the response and return its body as a byte vector. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/buffers-body-reqresp.md") )] /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::from_body(b"hello, world!".to_vec()); /// let bytes = resp.into_body_bytes(); /// assert_eq!(&bytes, b"hello, world!"); pub fn into_body_bytes(mut self) -> Vec<u8> { self.take_body_bytes() } /// Consume the response and return its body as a string. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/buffers-body-reqresp.md") )] /// /// # Panics /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/panics-reqresp-intobody-utf8.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::from_body("hello, world!"); /// let string = resp.into_body_str(); /// assert_eq!(&string, "hello, world!"); /// ``` pub fn into_body_str(mut self) -> String { self.take_body_str() } /// Consume the response and return its body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/creates-empty-body.md") )] pub fn into_body(self) -> Body { self.body.unwrap_or_else(|| Body::new()) } /// Consume the response and return its body if it has one, otherwise return `None`. pub fn try_into_body(self) -> Option<Body> { self.body } /// Builder-style equivalent of [`set_body_str()`][`Self::set_body_str()`]. pub fn with_body_str(mut self, body: &str) -> Self { self.set_body_str(body); self } /// Set the given string as the response's body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/discards-body.md") )] #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/sets-text-plain.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::new(); /// resp.set_body_str("hello, world!"); /// assert_eq!(resp.get_content_type(), Some(fastly::mime::TEXT_PLAIN_UTF_8)); /// assert_eq!(&resp.into_body_str(), "hello, world!"); /// ``` pub fn set_body_str(&mut self, body: &str) { self.body = Some(Body::from(body)); self.set_content_type(mime::TEXT_PLAIN_UTF_8); } /// Take and return the body from this response as a string. /// /// After calling this method, this response will no longer have a body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/buffers-body-reqresp.md") )] /// /// # Panics /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/panics-reqresp-takebody-utf8.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::from_body("hello, world!"); /// let string = resp.take_body_str(); /// assert!(resp.try_take_body().is_none()); /// assert_eq!(&string, "hello, world!"); /// ``` pub fn take_body_str(&mut self) -> String { if let Some(body) = self.try_take_body() { body.into_string() } else { String::new() } } /// Return a [`Lines`][`std::io::Lines`] iterator that reads the response body a line at a time. /// /// # Examples /// /// ```no_run /// # use fastly::{Body, Response}; /// use std::io::Write; /// /// fn remove_es(resp: &mut Response) { /// let mut no_es = Body::new(); /// for line in resp.read_body_lines() { /// writeln!(no_es, "{}", line.unwrap().replace("e", "")).unwrap(); /// } /// resp.set_body(no_es); /// } /// ``` pub fn read_body_lines(&mut self) -> std::io::Lines<&mut Body> { self.get_body_mut().lines() } /// Builder-style equivalent of [`set_body_bytes()`][`Self::set_body_bytes()`]. pub fn with_body_bytes(mut self, body: &[u8]) -> Self { self.set_body_bytes(body); self } /// Set the given bytes as the response's body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/discards-body.md") )] #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/sets-app-octet-stream.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::new(); /// resp.set_body_bytes(b"hello, world!"); /// assert_eq!(resp.get_content_type(), Some(fastly::mime::APPLICATION_OCTET_STREAM)); /// assert_eq!(&resp.into_body_bytes(), b"hello, world!"); /// ``` pub fn set_body_bytes(&mut self, body: &[u8]) { self.body = Some(Body::from(body)); self.set_content_type(mime::APPLICATION_OCTET_STREAM); } /// Take and return the body from this response as a string. /// /// After calling this method, this response will no longer have a body. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/buffers-body-reqresp.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::from_body(b"hello, world!".to_vec()); /// let bytes = resp.take_body_bytes(); /// assert!(resp.try_take_body().is_none()); /// assert_eq!(&bytes, b"hello, world!"); /// ``` pub fn take_body_bytes(&mut self) -> Vec<u8> { if let Some(body) = self.try_take_body() { body.into_bytes() } else { Vec::new() } } /// Return an iterator that reads the response body in chunks of at most the given number of /// bytes. /// /// If `chunk_size` does not evenly divide the length of the body, then the last chunk will not /// have length `chunk_size`. /// /// # Examples /// /// ```no_run /// # use fastly::{Body, Response}; /// fn remove_0s(resp: &mut Response) { /// let mut no_0s = Body::new(); /// for chunk in resp.read_body_chunks(4096) { /// let mut chunk = chunk.unwrap(); /// chunk.retain(|b| *b != 0); /// no_0s.write_bytes(&chunk); /// } /// resp.set_body(no_0s); /// } /// ``` pub fn read_body_chunks<'a>( &'a mut self, chunk_size: usize, ) -> impl Iterator<Item = Result<Vec<u8>, std::io::Error>> + 'a { self.get_body_mut().read_chunks(chunk_size) } /// Builder-style equivalent of [`set_body_json()`][Self::set_body_json()`]. pub fn with_body_json(mut self, value: &impl Serialize) -> Result<Self, serde_json::Error> { self.set_body_json(value)?; Ok(self) } /// Convert the given value to JSON and set that JSON as the response's body. /// /// The given value must implement [`serde::Serialize`]. You can either implement that trait for /// your own custom type, or use [`serde_json::Value`] to create untyped JSON values. See /// [`serde_json`] for details. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/discards-body.md") )] #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/sets-app-json.md") )] /// /// # Errors /// /// This method returns [`serde_json::Error`] if serialization fails. /// /// # Examples /// /// Using a type that derives [`serde::Serialize`]: /// /// ```no_run /// # use fastly::Response; /// #[derive(serde::Serialize)] /// struct MyData { /// name: String, /// count: u64, /// } /// let my_data = MyData { name: "Computers".to_string(), count: 1024 }; /// let mut resp = Response::new(); /// resp.set_body_json(&my_data).unwrap(); /// assert_eq!(resp.get_content_type(), Some(fastly::mime::APPLICATION_JSON)); /// assert_eq!(&resp.into_body_str(), r#"{"name":"Computers","count":1024}"#); /// ``` /// /// Using untyped JSON and the [`serde_json::json`] macro: /// /// ```no_run /// # use fastly::Response; /// let my_data = serde_json::json!({ /// "name": "Computers", /// "count": 1024, /// }); /// let mut resp = Response::new(); /// resp.set_body_json(&my_data).unwrap(); /// assert_eq!(resp.get_content_type(), Some(fastly::mime::APPLICATION_JSON)); /// assert_eq!(&resp.into_body_str(), r#"{"count":1024,"name":"Computers"}"#); /// ``` pub fn set_body_json(&mut self, value: &impl Serialize) -> Result<(), serde_json::Error> { self.body = Some(Body::new()); serde_json::to_writer(self.get_body_mut(), value)?; self.set_content_type(mime::APPLICATION_JSON); Ok(()) } /// Take the response body and attempt to parse it as a JSON value. /// /// The return type must implement [`serde::Deserialize`] without any non-static lifetimes. You /// can either implement that trait for your own custom type, or use [`serde_json::Value`] to /// deserialize untyped JSON values. See [`serde_json`] for details. /// /// After calling this method, this response will no longer have a body. /// /// # Errors /// /// This method returns [`serde_json::Error`] if deserialization fails. /// /// # Examples /// /// Using a type that derives [`serde::de::DeserializeOwned`]: /// /// ```no_run /// # use fastly::Response; /// #[derive(serde::Deserialize)] /// struct MyData { /// name: String, /// count: u64, /// } /// let mut resp = Response::from_body(r#"{"name":"Computers","count":1024}"#); /// let my_data = resp.take_body_json::<MyData>().unwrap(); /// assert_eq!(&my_data.name, "Computers"); /// assert_eq!(my_data.count, 1024); /// ``` /// /// Using untyped JSON with [`serde_json::Value`]: /// /// ```no_run /// # use fastly::Response; /// let my_data = serde_json::json!({ /// "name": "Computers", /// "count": 1024, /// }); /// let mut resp = Response::from_body(r#"{"name":"Computers","count":1024}"#); /// let my_data = resp.take_body_json::<serde_json::Value>().unwrap(); /// assert_eq!(my_data["name"].as_str(), Some("Computers")); /// assert_eq!(my_data["count"].as_u64(), Some(1024)); /// ``` pub fn take_body_json<T: DeserializeOwned>(&mut self) -> Result<T, serde_json::Error> { if let Some(body) = self.try_take_body() { serde_json::from_reader(body) } else { serde_json::from_reader(std::io::empty()) } } /// Builder-style equivalent of [`set_body_form()`][`Self::set_body_form()`]. pub fn with_body_form( mut self, value: &impl Serialize, ) -> Result<Self, serde_urlencoded::ser::Error> { self.set_body_form(value)?; Ok(self) } /// Convert the given value to `application/x-www-form-urlencoded` format and set that data as /// the response's body. /// /// The given value must implement [`serde::Serialize`]; see the trait documentation for /// details. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/discards-body.md") )] /// /// # Content type /// /// This method sets the content type to `application/x-www-form-urlencoded`. /// /// # Errors /// /// This method returns [`serde_urlencoded::ser::Error`] if serialization fails. /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// #[derive(serde::Serialize)] /// struct MyData { /// name: String, /// count: u64, /// } /// let my_data = MyData { name: "Computers".to_string(), count: 1024 }; /// let mut resp = Response::new(); /// resp.set_body_form(&my_data).unwrap(); /// assert_eq!(resp.get_content_type(), Some(fastly::mime::APPLICATION_WWW_FORM_URLENCODED)); /// assert_eq!(&resp.into_body_str(), "name=Computers&count=1024"); /// ``` pub fn set_body_form( &mut self, value: &impl Serialize, ) -> Result<(), serde_urlencoded::ser::Error> { self.body = Some(Body::new()); let s = serde_urlencoded::to_string(value)?; self.set_body(s); self.set_content_type(mime::APPLICATION_WWW_FORM_URLENCODED); Ok(()) } /// Take the response body and attempt to parse it as a `application/x-www-form-urlencoded` /// formatted string. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/returns-deserializeowned.md") )] /// /// After calling this method, this response will no longer have a body. /// /// # Errors /// /// This method returns [`serde_urlencoded::de::Error`] if deserialization fails. /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// #[derive(serde::Deserialize)] /// struct MyData { /// name: String, /// count: u64, /// } /// let mut resp = Response::from_body("name=Computers&count=1024"); /// let my_data = resp.take_body_form::<MyData>().unwrap(); /// assert_eq!(&my_data.name, "Computers"); /// assert_eq!(my_data.count, 1024); /// ``` pub fn take_body_form<T: DeserializeOwned>( &mut self, ) -> Result<T, serde_urlencoded::de::Error> { if let Some(body) = self.try_take_body() { serde_urlencoded::from_reader(body) } else { serde_urlencoded::from_reader(std::io::empty()) } } /// Get the MIME type described by the response's /// [`Content-Type`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type) /// header, or `None` if that header is absent or contains an invalid MIME type. /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::new().with_body_str("hello, world!"); /// assert_eq!(resp.get_content_type(), Some(fastly::mime::TEXT_PLAIN_UTF_8)); /// ``` pub fn get_content_type(&self) -> Option<Mime> { self.get_header_str(http::header::CONTENT_TYPE) .and_then(|v| v.parse().ok()) } /// Builder-style equivalent of [`set_content_type()`][`Self::set_content_type()`]. pub fn with_content_type(mut self, mime: Mime) -> Self { self.set_content_type(mime); self } /// Set the MIME type described by the response's /// [`Content-Type`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Type) /// header. /// /// Any existing `Content-Type` header values will be overwritten. /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::new().with_body_str("<p>hello, world!</p>"); /// resp.set_content_type(fastly::mime::TEXT_HTML_UTF_8); /// ``` pub fn set_content_type(&mut self, mime: Mime) { self.set_header(http::header::CONTENT_TYPE, mime.as_ref()) } /// Get the value of the response's /// [`Content-Length`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Length) /// header, if it exists. pub fn get_content_length(&self) -> Option<usize> { self.get_header(http::header::CONTENT_LENGTH) .and_then(|v| v.to_str().ok()) .and_then(|v| v.parse().ok()) } /// Returns whether the given header name is present in the response. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::new().with_header("hello", "world!"); /// assert!(resp.contains_header("hello")); /// assert!(!resp.contains_header("not-present")); /// ``` pub fn contains_header(&self, name: impl ToHeaderName) -> bool { self.headers.contains_key(name.into_borrowable().as_ref()) } /// Builder-style equivalent of [`set_header()`][`Self::set_header()`]. pub fn with_header(mut self, name: impl ToHeaderName, value: impl ToHeaderValue) -> Self { self.set_header(name, value); self } /// Get the value of a header as a string, or `None` if the header is not present. /// /// If there are multiple values for the header, only one is returned, which may be any of the /// values. See [`get_header_all_str()`][`Self::get_header_all_str()`] if you need to get all of /// the values. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Panics /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/panics-reqresp-header-utf8.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::new().with_header("hello", "world!"); /// assert_eq!(resp.get_header_str("hello"), Some("world")); /// ``` pub fn get_header_str<'a>(&self, name: impl ToHeaderName) -> Option<&str> { let name = name.into_borrowable(); if let Some(hdr) = self.get_header(name.as_ref()) { Some( hdr.to_str().unwrap_or_else(|_| { panic!("invalid UTF-8 HTTP header value for header: {}", name) }), ) } else { None } } /// Get the value of a header, or `None` if the header is not present. /// /// If there are multiple values for the header, only one is returned, which may be any of the /// values. See [`get_header_all()`][`Self::get_header_all()`] if you need to get all of the /// values. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Examples /// /// Handling UTF-8 values explicitly: /// /// ```no_run /// # use fastly::Response; /// # use fastly::http::HeaderValue; /// let resp = Response::new().with_header("hello", "world!"); /// assert_eq!(resp.get_header("hello"), Some(&HeaderValue::from_static("world"))); /// ``` /// /// Safely handling invalid UTF-8 values: /// /// ```no_run /// # use fastly::Response; /// let invalid_utf8 = &"🐈".as_bytes()[0..3]; /// let resp = Response::new().with_header("hello", invalid_utf8); /// assert_eq!(resp.get_header("hello").unwrap().as_bytes(), invalid_utf8); /// ``` pub fn get_header<'a>(&self, name: impl ToHeaderName) -> Option<&HeaderValue> { self.headers.get(name.into_borrowable().as_ref()) } /// Get all values of a header as strings, or an empty vector if the header is not present. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Panics /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/panics-reqresp-headers-utf8.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::new() /// .with_header("hello", "world!") /// .with_header("hello", "universe!"); /// let values = resp.get_header_all_str("hello"); /// assert_eq!(values.len(), 2); /// assert!(values.contains(&"world!")); /// assert!(values.contains(&"universe!")); /// ``` pub fn get_header_all_str<'a>(&self, name: impl ToHeaderName) -> Vec<&str> { let name = name.into_borrowable(); self.get_header_all(name.as_ref()) .map(|v| { v.to_str() .unwrap_or_else(|_| panic!("non-UTF-8 HTTP header value for header: {}", name)) }) .collect() } /// Get an iterator of all the values of a header. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Examples /// /// You can turn the iterator into collection, like [`Vec`]: /// /// ```no_run /// # use fastly::Response; /// # use fastly::http::HeaderValue; /// let invalid_utf8 = &"🐈".as_bytes()[0..3]; /// let resp = Response::new() /// .with_header("hello", "world!") /// .with_header("hello", invalid_utf8); /// /// let values: Vec<&HeaderValue> = resp.get_header_all("hello").collect(); /// assert_eq!(values.len(), 2); /// assert!(values.contains(&&HeaderValue::from_static("world!"))); /// assert!(values.contains(&&HeaderValue::from_bytes(invalid_utf8).unwrap())); /// ``` /// /// You can use the iterator in a loop: /// /// ```no_run /// # use fastly::Response; /// let invalid_utf8 = &"🐈".as_bytes()[0..3]; /// let resp = Response::new() /// .with_header("hello", "world!") /// .with_header("hello", invalid_utf8); /// /// for value in resp.get_header_all("hello") { /// if let Ok(s) = value.to_str() { /// log::debug!("hello, {}", s); /// } else { /// log::debug!("hello, invalid UTF-8!"); /// } /// } /// ``` pub fn get_header_all<'a>( &'a self, name: impl ToHeaderName, ) -> impl Iterator<Item = &'a HeaderValue> { self.headers.get_all(name.into_borrowable().as_ref()).iter() } /// Get all of the response's header names as strings, or an empty vector if no headers are /// present. /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let resp = Response::new() /// .with_header("hello", "world!") /// .with_header("goodbye", "latency!"); /// let names = resp.get_header_names_str(); /// assert_eq!(names.len(), 2); /// assert!(names.contains(&"hello")); /// assert!(names.contains(&"goodbye")); /// ``` pub fn get_header_names_str(&self) -> Vec<&str> { self.get_header_names().map(|n| n.as_str()).collect() } /// Get an iterator of all the response's header names. /// /// # Examples /// /// You can turn the iterator into collection, like [`Vec`]: /// /// ```no_run /// # use fastly::Response; /// # use fastly::http::header::HeaderName; /// let resp = Response::new() /// .with_header("hello", "world!") /// .with_header("goodbye", "latency!"); /// /// let values: Vec<&HeaderName> = resp.get_header_names().collect(); /// assert_eq!(values.len(), 2); /// assert!(values.contains(&&HeaderName::from_static("hello"))); /// assert!(values.contains(&&HeaderName::from_static("goodbye"))); /// ``` /// /// You can use the iterator in a loop: /// /// ```no_run /// # use fastly::Response; /// let resp = Response::new() /// .with_header("hello", "world!") /// .with_header("goodbye", "latency!"); /// /// for name in resp.get_header_names() { /// log::debug!("saw header: {:?}", name); /// } /// ``` pub fn get_header_names(&self) -> impl Iterator<Item = &HeaderName> { self.headers.keys() } /// Set a response header to the given value, discarding any previous values for the given /// header name. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-value-argument.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::new(); /// /// resp.set_header("hello", "world!"); /// assert_eq!(resp.get_header_str("hello"), Some("world!")); /// /// resp.set_header("hello", "universe!"); /// /// let values = resp.get_header_all_str("hello"); /// assert_eq!(values.len(), 1); /// assert!(!values.contains(&"world!")); /// assert!(values.contains(&"universe!")); /// ``` pub fn set_header(&mut self, name: impl ToHeaderName, value: impl ToHeaderValue) { self.headers.insert(name.into_owned(), value.into_owned()); } /// Add a response header with given value. /// /// Unlike [`set_header()`][`Self::set_header()`], this does not discard existing values for the /// same header name. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-value-argument.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::new(); /// /// resp.set_header("hello", "world!"); /// assert_eq!(resp.get_header_str("hello"), Some("world!")); /// /// resp.append_header("hello", "universe!"); /// /// let values = resp.get_header_all_str("hello"); /// assert_eq!(values.len(), 2); /// assert!(values.contains(&"world!")); /// assert!(values.contains(&"universe!")); /// ``` pub fn append_header(&mut self, name: impl ToHeaderName, value: impl ToHeaderValue) { self.headers .append(name.into_borrowable().as_ref(), value.into_owned()); } /// Remove all response headers of the given name, and return one of the removed header values /// if any were present. /// /// If the header has multiple values, one is returned arbitrarily. To get all of the removed /// header values, or to get a specific value, use /// [`get_header_all()`][`Self::get_header_all()`]. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// # use fastly::http::HeaderValue; /// let mut resp = Response::new().with_header("hello", "world!"); /// assert_eq!(resp.get_header_str("hello"), Some("world!")); /// assert_eq!(resp.remove_header("hello"), Some(HeaderValue::from_static("world!"))); /// assert!(resp.remove_header("not-present").is_none()); /// ``` pub fn remove_header(&mut self, name: impl ToHeaderName) -> Option<HeaderValue> { self.headers.remove(name.into_borrowable().as_ref()) } /// Remove all response headers of the given name, and return one of the removed header values /// as a string if any were present. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/removes-one-header.md") )] /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/header-name-argument.md") )] /// /// # Panics /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/panics-reqresp-remove-header-utf8.md") )] /// /// # Examples /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::new().with_header("hello", "world!"); /// assert_eq!(resp.get_header_str("hello"), Some("world!")); /// assert_eq!(resp.remove_header_str("hello"), Some("world!".to_string())); /// assert!(resp.remove_header_str("not-present").is_none()); /// ``` pub fn remove_header_str(&mut self, name: impl ToHeaderName) -> Option<String> { let name = name.into_borrowable(); if let Some(hdr) = self.remove_header(name.as_ref()) { Some( hdr.to_str() .map(|s| s.to_owned()) .unwrap_or_else(|_| panic!("non-UTF-8 HTTP header value for header: {}", name)), ) } else { None } } /// Builder-style equivalent of [`set_status()`][`Self::set_status()`]. pub fn with_status(mut self, status: impl ToStatusCode) -> Self { self.set_status(status); self } /// Get the HTTP status code of the response. pub fn get_status(&self) -> StatusCode { self.status } /// Set the HTTP status code of the response. /// #[cfg_attr( feature = "unstable-doc", doc(include = "../../docs/snippets/statuscode-argument.md") )] /// /// # Examples /// /// Using the constants from [`StatusCode`]: /// /// ```no_run /// # use fastly::Response; /// use fastly::http::StatusCode; /// /// let mut resp = Response::from_body("not found!"); /// resp.set_status(StatusCode::NOT_FOUND); /// resp.send_to_client(); /// ``` /// /// Using a `u16`: /// /// ```no_run /// # use fastly::Response; /// let mut resp = Response::from_body("not found!"); /// resp.set_status(404); /// resp.send_to_client(); /// ``` pub fn set_status(&mut self, status: impl ToStatusCode) { self.status = status.to_status_code(); } /// Builder-style equivalent of [`set_version()`][`Self::set_version()`]. pub fn with_version(mut self, version: Version) -> Self { self.set_version(version); self } /// Get the HTTP version of this response. pub fn get_version(&self) -> Version { self.version } /// Set the HTTP version of this response. pub fn set_version(&mut self, version: Version) { self.version = version; } /// Get the name of the [`Backend`] this response came from, or `None` if the response is /// synthetic. /// /// # Examples /// /// From a backend response: /// /// ```no_run /// # use fastly::Request; /// let backend_resp = Request::get("https://example.com/").send("example_backend").unwrap(); /// assert_eq!(backend_resp.get_backend_name(), Some("example_backend")); /// ``` /// /// From a synthetic response: /// /// ```no_run /// # use fastly::Response; /// let synthetic_resp = Response::new(); /// assert!(synthetic_resp.get_backend_name().is_none()); /// ``` pub fn get_backend_name(&self) -> Option<&str> { self.get_backend().map(|be| be.name()) } /// Get the backend this response came from, or `None` if the response is synthetic. /// /// # Examples /// /// From a backend response: /// /// ```no_run /// # use fastly::{Backend, Request}; /// let backend_resp = Request::get("https://example.com/").send("example_backend").unwrap(); /// assert_eq!(backend_resp.get_backend(), Some(&Backend::from_name("example_backend").unwrap())); /// ``` /// /// From a synthetic response: /// /// ```no_run /// # use fastly::Response; /// let synthetic_resp = Response::new(); /// assert!(synthetic_resp.get_backend().is_none()); /// ``` pub fn get_backend(&self) -> Option<&Backend> { self.fastly_metadata.as_ref().and_then(|md| md.backend()) } /// Get the request this response came from, or `None` if the response is synthetic. /// /// Note that the returned request will only have the headers and metadata of the original /// request, as the body is consumed when sending the request. /// /// This method only returns a reference to the backend request. To instead take and return the /// owned request (for example, to subsequently send the request again), use /// [`take_backend_request()`][`Self::take_backend_request()`]. /// /// # Examples /// /// From a backend response: /// /// ```no_run /// # use fastly::Request; /// let backend_resp = Request::post("https://example.com/") /// .with_body("hello") /// .send("example_backend") /// .unwrap(); /// let backend_req = backend_resp.get_backend_request().expect("response is not synthetic"); /// assert_eq!(backend_req.get_url_str(), "https://example.com/"); /// assert!(!backend_req.has_body()); /// ``` /// /// From a synthetic response: /// /// ```no_run /// # use fastly::Response; /// let synthetic_resp = Response::new(); /// assert!(synthetic_resp.get_backend_request().is_none()); /// ``` pub fn get_backend_request(&self) -> Option<&Request> { self.fastly_metadata.as_ref().and_then(|md| md.sent_req()) } /// Take and return the request this response came from, or `None` if the response is synthetic. /// /// Note that the returned request will only have the headers and metadata of the original /// request, as the body is consumed when sending the request. /// /// # Examples /// /// From a backend response: /// /// ```no_run /// # use fastly::Request; /// let mut backend_resp = Request::post("https://example.com/") /// .with_body("hello") /// .send("example_backend") /// .unwrap(); /// let backend_req = backend_resp.take_backend_request().expect("response is not synthetic"); /// assert_eq!(backend_req.get_url_str(), "https://example.com/"); /// assert!(!backend_req.has_body()); /// backend_req.with_body("goodbye").send("example_backend").unwrap(); /// ``` /// /// From a synthetic response: /// /// ```no_run /// # use fastly::Response; /// let mut synthetic_resp = Response::new(); /// assert!(synthetic_resp.take_backend_request().is_none()); /// ``` pub fn take_backend_request(&mut self) -> Option<Request> { self.fastly_metadata .as_mut() .and_then(|md| md.take_sent_req()) } pub(crate) fn set_fastly_metadata(&mut self, md: FastlyResponseMetadata) { self.fastly_metadata = Some(md); } /// Begin sending the response to the client. /// /// This method returns as soon as the response header begins sending to the client, and /// transmission of the response will continue in the background. /// /// Once this method is called, nothing else may be added to the response body. To stream /// additional data to a response body after it begins to send, use /// [`stream_to_client`][`Self::stream_to_client()`]. /// /// # Panics /// /// This method panics if another response has already been sent to the client by this method, /// by [`stream_to_client()`][`Self::stream_to_client()`], or by the equivalent methods of /// [`ResponseHandle`]. /// /// # Examples /// /// Sending a backend response without modification: /// /// ```no_run /// # use fastly::Request; /// Request::get("https://example.com/").send("example_backend").unwrap().send_to_client(); /// ``` /// /// Removing a header from a backend response before sending to the client: /// /// ```no_run /// # use fastly::Request; /// let mut backend_resp = Request::get("https://example.com/").send("example_backend").unwrap(); /// backend_resp.remove_header("bad-header"); /// backend_resp.send_to_client(); /// ``` /// /// Sending a synthetic response: /// /// ```no_run /// # use fastly::Response; /// Response::from_body("hello, world!").send_to_client(); /// ``` pub fn send_to_client(self) { let res = self.send_to_client_impl(false, true); debug_assert!(res.is_none()); } /// Deprecated alias of [`Response::send_to_client()`] #[deprecated(since = "0.6.0", note = "renamed to `Response::send_to_client()`")] pub fn send_downstream(self) { self.send_to_client() } /// Begin sending the response to the client, and return a [`StreamingBody`] that can accept /// further data to send. /// /// This method is most useful for programs that do some sort of processing or inspection of a /// potentially-large backend response body. Streaming allows the program to operate on small /// parts of the body rather than having to read it all into memory at once. /// /// This method returns as soon as the response header begins sending to the client, and /// transmission of the response will continue in the background. /// /// Note that the client connection is only closed once the [`StreamingBody`] is dropped. You /// can explicitly drop the body once finished to avoid holding the connection open longer than /// necessary. /// /// # Panics /// /// This method panics if another response has already been sent to the client by this method, /// by [`send_to_client()`][`Self::send_to_client()`], or by the equivalent methods of /// [`ResponseHandle`]. /// /// # Examples /// /// Count the number of lines in a UTF-8 backend response body while sending it to the client: /// /// ```no_run /// # use fastly::Request; /// use std::io::BufRead; /// /// let mut backend_resp = Request::get("https://example.com/").send("example_backend").unwrap(); /// // Take the body so we can iterate through its lines later /// let backend_resp_body = backend_resp.take_body(); /// // Start sending the backend response to the client with a now-empty body /// let mut client_body = backend_resp.stream_to_client(); /// /// let mut num_lines = 0; /// for line in backend_resp_body.lines() { /// let line = line.unwrap(); /// num_lines += 1; /// // Write the line to the streaming client body /// client_body.write_str(&line); /// } /// // Drop the streaming body to allow the client connection to close /// drop(client_body); /// /// log::debug!("backend response body contained {} lines", num_lines); /// ``` pub fn stream_to_client(self) -> StreamingBody { let res = self.send_to_client_impl(true, true); // streaming = true means we always get back a `Some` res.expect("streaming body is present") } /// Deprecated alias of [`Response::stream_to_client()`] #[deprecated(since = "0.6.0", note = "renamed to `Response::stream_to_client()`")] pub fn send_downstream_streaming(self) -> StreamingBody { self.stream_to_client() } /// Send a response to the client. /// /// This will return a [`StreamingBody`] if and only if `streaming` is true. If a response has /// already been sent to the client, and `panic_on_multiple_send` is `true`, this function will /// panic. /// /// This method is public, but hidden from generated documentation in order to support the /// implementation of [`panic_with_status()`]. #[doc(hidden)] pub fn send_to_client_impl( self, streaming: bool, panic_on_multiple_send: bool, ) -> Option<StreamingBody> { use std::sync::atomic::{AtomicBool, Ordering}; /// A flag representing whether or not we have sent a response to the client. static SENT: AtomicBool = AtomicBool::new(false); // Set our sent flag, and panic if we have already sent a response. if panic_on_multiple_send && SENT.swap(true, Ordering::SeqCst) { panic!("cannot send more than one client response per execution"); } let (resp_handle, body_handle) = self.into_handles(); // Send the response to the client using the appropriate method based on the `streaming` flag. if streaming { Some(resp_handle.stream_to_client(body_handle).into()) } else { resp_handle.send_to_client(body_handle); None } } /// Create a [`Response`] from the a [`ResponseHandle`] and a [`BodyHandle`], returning an error /// if any [`ResponseLimits`][`crate::limits::ResponseLimits`] are exceeded. /// /// The extra metadata associated with a backend response is not tracked by the low-level handle /// APIs. As a result, methods like [`get_backend()`][`Self::get_backend()`] and /// [`get_backend_request()`][`Self::get_backend_request()`] will always return `None` for a /// request created from handles. pub fn from_handles( resp_handle: ResponseHandle, body_handle: BodyHandle, ) -> Result<Self, BufferSizeError> { let mut resp = Response::new() .with_status(resp_handle.get_status()) .with_version(resp_handle.get_version()); let resp_limits = limits::RESPONSE_LIMITS.read().unwrap(); for name in resp_handle.get_header_names_impl( limits::DEFAULT_MAX_HEADER_NAME_BYTES, resp_limits.max_header_name_bytes, ) { let name = name.expect("response header names too large"); for value in resp_handle.get_header_values_impl( &name, limits::DEFAULT_MAX_HEADER_VALUE_BYTES, resp_limits.max_header_value_bytes, ) { let value = value.expect("response header values too large"); resp.append_header(&name, value); } } Ok(resp.with_body(body_handle)) } /// Create a [`ResponseHandle`]/[`BodyHandle`] pair from a [`Response`]. /// /// The extra metadata associated with a backend response is not tracked by the low-level handle /// APIs. As a result, converting to handles will cause the backend and request associated with /// a backend response to be lost. pub fn into_handles(mut self) -> (ResponseHandle, BodyHandle) { // Convert to a body handle, or create an empty body handle if none is set. let body_handle = if let Some(body) = self.try_take_body() { body.into_handle() } else { BodyHandle::new() }; // Mint a response handle, and set the HTTP status code, version, and headers. let mut resp_handle = ResponseHandle::new(); resp_handle.set_status(self.status); resp_handle.set_version(self.version); for name in self.headers.keys() { resp_handle.set_header_values(name, self.headers.get_all(name)); } (resp_handle, body_handle) } } /// Anything that we need to make a full roundtrip through the `http` types that doesn't have a more /// concrete corresponding type. #[derive(Debug)] struct FastlyExts { fastly_metadata: Option<FastlyResponseMetadata>, } impl Into<http::Response<Body>> for Response { fn into(self) -> http::Response<Body> { let mut resp = http::Response::new(self.body.unwrap_or_else(|| Body::new())); resp.extensions_mut().insert(FastlyExts { fastly_metadata: self.fastly_metadata, }); *resp.headers_mut() = self.headers; *resp.status_mut() = self.status; *resp.version_mut() = self.version; resp } } impl From<http::Response<Body>> for Response { fn from(from: http::Response<Body>) -> Self { let (mut parts, body) = from.into_parts(); let fastly_metadata = parts .extensions .remove() .and_then(|exts: FastlyExts| exts.fastly_metadata); Response { version: parts.version, status: parts.status, headers: parts.headers, body: Some(body), fastly_metadata, } } } /// Additional Fastly-specific metadata for responses. #[derive(Debug)] pub(crate) struct FastlyResponseMetadata { backend: Backend, sent_req: Option<Request>, } impl Clone for FastlyResponseMetadata { fn clone(&self) -> Self { Self { backend: self.backend.clone(), // sent_req never has a body, so it is fine to clone without it sent_req: self.sent_req.as_ref().map(Request::clone_without_body), } } } impl FastlyResponseMetadata { /// Create a response metadata object, given the request and the backend name. pub fn new(backend: Backend, sent_req: Request) -> Self { Self { backend, sent_req: Some(sent_req), } } /// Get a reference to the backend that this response came from. pub fn backend(&self) -> Option<&Backend> { // ACF 2020-06-17: this is wrapped in an option for future compatibility when we might have // `FastlyResponseMetadata`s on responses that didn't come from a backend Some(&self.backend) } /// Get a reference to the original request associated with this response. /// /// Note that the request's original body has already been sent, so the returned request does /// not have a body. pub fn sent_req(&self) -> Option<&Request> { self.sent_req.as_ref() } pub(crate) fn take_sent_req(&mut self) -> Option<Request> { self.sent_req.take() } } /// Send a response to the client with the given HTTP status code, and then panic. /// /// By default, Rust panics will cause a generic `500 Internal Server Error` response to be sent to /// the client, if a response has not already been sent. This macro allows you to customize the /// status code, although the response is still generic. /// /// The syntax is similar to [`panic!()`], but takes an optional first argument that must implement /// [`ToStatusCode`], such as [`StatusCode`] or [`u16`]. The optional message and format arguments /// are passed to [`panic!()`] unchanged, and so will be printed to the logging endpoint specified /// by [`set_panic_endpoint()`][`crate::log::set_panic_endpoint()`]. /// /// # Examples /// /// ```no_run /// # use fastly::{Request, panic_with_status}; /// let req = Request::get("https://example.com/bad_path"); /// if req.get_path().starts_with("bad") { /// panic_with_status!(403, "forbade request to a bad path: {}", req.get_url_str()); /// } /// ``` #[macro_export] macro_rules! panic_with_status { () => { $crate::panic_with_status!($crate::http::StatusCode::INTERNAL_SERVER_ERROR) }; ($status:expr) => {{ $crate::Response::new().with_status($status).send_to_client_impl(false, false); panic!(); }}; ($status:expr, $($arg:tt)*) => {{ $crate::Response::new().with_status($status).send_to_client_impl(false, false); panic!($($arg)*); }}; }