Struct isahc::AsyncBody [−][src]
pub struct AsyncBody(_);
Expand description
Contains the body of an asynchronous HTTP request or response.
This type is used to encapsulate the underlying stream or region of memory
where the contents of the body are stored. An AsyncBody
can be created
from many types of sources using the Into
trait or
one of its constructor functions.
For asynchronous requests, you must use an asynchronous body, because the
entire request lifecycle is also asynchronous. You can create a body from
anything that implements [AsyncRead
], which AsyncBody
itself also
implements.
For synchronous requests, use Body
instead.
Implementations
Create a new empty body.
An empty body represents the absence of a body, which is semantically different than the presence of a body of zero length.
Create a new body from a potentially static byte buffer.
The body will have a known length equal to the number of bytes given.
This will try to prevent a copy if the type passed in can be re-used, otherwise the buffer will be copied first. This method guarantees to not require a copy for the following types:
&'static [u8]
&'static str
Examples
use isahc::Body;
// Create a body from a static string.
let body = Body::from_bytes_static("hello world");
Create a streaming body that reads from the given reader.
The body will have an unknown length. When used as a request body, chunked transfer encoding might be used to send the request.
pub fn from_reader_sized<R>(read: R, length: u64) -> Self where
R: AsyncRead + Send + Sync + 'static,
pub fn from_reader_sized<R>(read: R, length: u64) -> Self where
R: AsyncRead + Send + Sync + 'static,
Create a streaming body with a known length.
If the size of the body is known in advance, such as with a file, then
this function can be used to create a body that can determine its
Content-Length
while still reading the bytes asynchronously.
Giving a value for length
that doesn’t actually match how much data
the reader will produce may result in errors when sending the body in a
request.
Report if this body is empty.
This is not necessarily the same as checking for self.len() == Some(0)
. Since HTTP message bodies are optional, there is a semantic
difference between the absence of a body and the presence of a
zero-length body. This method will only return true
for the former.
Get the size of the body, if known.
The value reported by this method is used to set the Content-Length
for outgoing requests.
When coming from a response, this method will report the value of the
Content-Length
response header if present. If this method returns
None
then there’s a good chance that the server used something like
chunked transfer encoding to send the response body.
Since the length may be determined totally separately from the actual bytes, even if a value is returned it should not be relied on as always being accurate, and should be treated as a “hint”.
Trait Implementations
Auto Trait Implementations
impl !RefUnwindSafe for AsyncBody
impl !UnwindSafe for AsyncBody
Blanket Implementations
Reads some bytes from the byte stream. Read more
fn read_vectored(
&'a mut self,
bufs: &'a mut [IoSliceMut<'a>]
) -> ReadVectoredFuture<'a, Self> where
Self: Unpin,
fn read_vectored(
&'a mut self,
bufs: &'a mut [IoSliceMut<'a>]
) -> ReadVectoredFuture<'a, Self> where
Self: Unpin,
fn read_to_end(
&'a mut self,
buf: &'a mut Vec<u8, Global>
) -> ReadToEndFuture<'a, Self> where
Self: Unpin,
fn read_to_end(
&'a mut self,
buf: &'a mut Vec<u8, Global>
) -> ReadToEndFuture<'a, Self> where
Self: Unpin,
fn read_to_string(
&'a mut self,
buf: &'a mut String
) -> ReadToStringFuture<'a, Self> where
Self: Unpin,
fn read_to_string(
&'a mut self,
buf: &'a mut String
) -> ReadToStringFuture<'a, Self> where
Self: Unpin,
Reads the exact number of bytes required to fill buf
. Read more
Creates an adapter which will read at most limit
bytes from it. Read more
Creates an adapter which will chain this stream with another. Read more
Mutably borrows from an owned value. Read more
Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more