headers/common/
access_control_request_method.rs

1use http::{HeaderName, HeaderValue, Method};
2
3use crate::{Error, Header};
4
5/// `Access-Control-Request-Method` header, part of
6/// [CORS](http://www.w3.org/TR/cors/#access-control-request-method-request-header)
7///
8/// The `Access-Control-Request-Method` header indicates which method will be
9/// used in the actual request as part of the preflight request.
10/// # ABNF
11///
12/// ```text
13/// Access-Control-Request-Method: \"Access-Control-Request-Method\" \":\" Method
14/// ```
15///
16/// # Example values
17/// * `GET`
18///
19/// # Examples
20///
21/// ```
22/// extern crate http;
23/// use headers::AccessControlRequestMethod;
24/// use http::Method;
25///
26/// let req_method = AccessControlRequestMethod::from(Method::GET);
27/// ```
28#[derive(Clone, Debug, PartialEq, Eq, Hash)]
29pub struct AccessControlRequestMethod(Method);
30
31impl Header for AccessControlRequestMethod {
32    fn name() -> &'static HeaderName {
33        &::http::header::ACCESS_CONTROL_REQUEST_METHOD
34    }
35
36    fn decode<'i, I: Iterator<Item = &'i HeaderValue>>(values: &mut I) -> Result<Self, Error> {
37        values
38            .next()
39            .and_then(|value| Method::from_bytes(value.as_bytes()).ok())
40            .map(AccessControlRequestMethod)
41            .ok_or_else(Error::invalid)
42    }
43
44    fn encode<E: Extend<HeaderValue>>(&self, values: &mut E) {
45        // For the more common methods, try to use a static string.
46        let s = match self.0 {
47            Method::GET => "GET",
48            Method::POST => "POST",
49            Method::PUT => "PUT",
50            Method::DELETE => "DELETE",
51            _ => {
52                let val = HeaderValue::from_str(self.0.as_ref())
53                    .expect("Methods are also valid HeaderValues");
54                values.extend(::std::iter::once(val));
55                return;
56            }
57        };
58
59        values.extend(::std::iter::once(HeaderValue::from_static(s)));
60    }
61}
62
63impl From<Method> for AccessControlRequestMethod {
64    fn from(method: Method) -> AccessControlRequestMethod {
65        AccessControlRequestMethod(method)
66    }
67}
68
69impl From<AccessControlRequestMethod> for Method {
70    fn from(method: AccessControlRequestMethod) -> Method {
71        method.0
72    }
73}
headers/common/access_control_request_method.rs

headers/common/
access_control_request_method.rs
