feat: add keep alive header

src/header/mod.rs

@@ -96,6 +96,7 @@ pub use self::name::{
     IF_RANGE,
     IF_UNMODIFIED_SINCE,
     LAST_MODIFIED,
+    KEEP_ALIVE,
     LINK,
     LOCATION,
     MAX_FORWARDS,

src/header/name.rs

@@ -682,6 +682,12 @@ standard_headers! {
     /// The value is a valid Date/Time string defined in [RFC9910](https://datatracker.ietf.org/doc/html/rfc9110#section-5.6.7)
     (LastModified, LAST_MODIFIED, b"last-modified");
 
+    /// Non-standard HTTP header.
+    /// Hint about how the connection and may be used to set a timeout and a
+    /// maximum amount of requests.
+    #[doc(hidden)]
+    (KeepAlive, KEEP_ALIVE, b"keep-alive");
+
     /// Allows the server to point an interested client to another resource
     /// containing metadata about the requested resource.
     (Link, LINK, b"link");

tests/header_map.rs

@@ -397,6 +397,7 @@ const STD: &'static [HeaderName] = &[
     IF_RANGE,
     IF_UNMODIFIED_SINCE,
     LAST_MODIFIED,
+    KEEP_ALIVE,
     LINK,
     LOCATION,
     MAX_FORWARDS,

tests/header_map_fuzz.rs

@@ -299,6 +299,7 @@ fn gen_header_name(g: &mut StdRng) -> HeaderName {
         header::IF_RANGE,
         header::IF_UNMODIFIED_SINCE,
         header::LAST_MODIFIED,
+        header::KEEP_ALIVE,
         header::LINK,
         header::LOCATION,
         header::MAX_FORWARDS,