hyper_sync/header/common/
expect.rs

1use std::fmt;
2use std::str;
3use unicase;
4
5use header::{Header, Raw};
6
7/// The `Expect` header.
8///
9/// > The "Expect" header field in a request indicates a certain set of
10/// > behaviors (expectations) that need to be supported by the server in
11/// > order to properly handle this request.  The only such expectation
12/// > defined by this specification is 100-continue.
13/// >
14/// >    Expect  = "100-continue"
15///
16/// # Example
17/// ```
18/// use hyper_sync::header::{Headers, Expect};
19/// let mut headers = Headers::new();
20/// headers.set(Expect::Continue);
21/// ```
22#[derive(Copy, Clone, PartialEq, Debug)]
23pub enum Expect {
24    /// The value `100-continue`.
25    Continue
26}
27
28impl Header for Expect {
29    fn header_name() -> &'static str {
30        static NAME: &'static str = "Expect";
31        NAME
32    }
33
34    fn parse_header(raw: &Raw) -> ::Result<Expect> {
35        if let Some(line) = raw.one() {
36            let text = unsafe {
37                // safe because:
38                // 1. we don't actually care if it's utf8, we just want to
39                //    compare the bytes with the "case" normalized. If it's not
40                //    utf8, then the byte comparison will fail, and we'll return
41                //    None. No big deal.
42                str::from_utf8_unchecked(line)
43            };
44            if unicase::eq_ascii(text, "100-continue") {
45                Ok(Expect::Continue)
46            } else {
47                Err(::Error::Header)
48            }
49        } else {
50            Err(::Error::Header)
51        }
52    }
53
54    fn fmt_header(&self, f: &mut ::header::Formatter) -> fmt::Result {
55        f.fmt_line(self)
56    }
57}
58
59impl fmt::Display for Expect {
60    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
61        f.write_str("100-continue")
62    }
63}
hyper_sync/header/common/expect.rs

hyper_sync/header/common/
expect.rs
