feature: enable Link support

This commit enables the `link` module. This implementation is not ready to be merged yet and needs more fixes to address feedback from [the previous PR attempting to enable `Link` support](hyperium#113)

Author: demurgos

Cargo.toml

@@ -20,6 +20,7 @@ http = "1.0.0"
 headers-core = { version = "0.3", path = "./headers-core" }
 base64 = "0.22"
 bytes = "1"
+language-tags = "0.3.2"
 mime = "0.3.14"
 sha1 = "0.10"
 httpdate = "1"

src/disabled/link.rs renamed to src/common/link.rs

@@ -1105,6 +1105,5 @@ mod tests {
         assert_eq!(err.is_err(), true);
     }
 
-    // the `bench_header` macro is defined in `crate::common`, not available in `crate::disabled`
-    // bench_header!(bench_link, Link, b"<http://example.com/TheBook/chapter2>; rel=\"previous\"; rev=next; title=\"previous chapter\"; type=\"text/html\"; media=\"screen, tty\"");
+    bench_header!(bench_link, Link, b"<http://example.com/TheBook/chapter2>; rel=\"previous\"; rev=next; title=\"previous chapter\"; type=\"text/html\"; media=\"screen, tty\"");
 }

src/common/mod.rs

@@ -165,7 +165,7 @@ mod if_range;
 mod if_unmodified_since;
 //mod last_event_id;
 mod last_modified;
-//mod link;
+pub mod link;
 mod location;
 mod origin;
 mod pragma;