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diff --git a/third_party/rust/headers/src/common/set_cookie.rs b/third_party/rust/headers/src/common/set_cookie.rs
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+++ b/third_party/rust/headers/src/common/set_cookie.rs
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+/// `Set-Cookie` header, defined [RFC6265](http://tools.ietf.org/html/rfc6265#section-4.1)
+///
+/// The Set-Cookie HTTP response header is used to send cookies from the
+/// server to the user agent.
+///
+/// Informally, the Set-Cookie response header contains the header name
+/// "Set-Cookie" followed by a ":" and a cookie.  Each cookie begins with
+/// a name-value-pair, followed by zero or more attribute-value pairs.
+///
+/// # ABNF
+///
+/// ```text
+/// set-cookie-header = "Set-Cookie:" SP set-cookie-string
+/// set-cookie-string = cookie-pair *( ";" SP cookie-av )
+/// cookie-pair       = cookie-name "=" cookie-value
+/// cookie-name       = token
+/// cookie-value      = *cookie-octet / ( DQUOTE *cookie-octet DQUOTE )
+/// cookie-octet      = %x21 / %x23-2B / %x2D-3A / %x3C-5B / %x5D-7E
+///                       ; US-ASCII characters excluding CTLs,
+///                       ; whitespace DQUOTE, comma, semicolon,
+///                       ; and backslash
+/// token             = <token, defined in [RFC2616], Section 2.2>
+///
+/// cookie-av         = expires-av / max-age-av / domain-av /
+///                    path-av / secure-av / httponly-av /
+///                     extension-av
+/// expires-av        = "Expires=" sane-cookie-date
+/// sane-cookie-date  = <rfc1123-date, defined in [RFC2616], Section 3.3.1>
+/// max-age-av        = "Max-Age=" non-zero-digit *DIGIT
+///                       ; In practice, both expires-av and max-age-av
+///                       ; are limited to dates representable by the
+///                       ; user agent.
+/// non-zero-digit    = %x31-39
+///                       ; digits 1 through 9
+/// domain-av         = "Domain=" domain-value
+/// domain-value      = <subdomain>
+///                       ; defined in [RFC1034], Section 3.5, as
+///                       ; enhanced by [RFC1123], Section 2.1
+/// path-av           = "Path=" path-value
+/// path-value        = <any CHAR except CTLs or ";">
+/// secure-av         = "Secure"
+/// httponly-av       = "HttpOnly"
+/// extension-av      = <any CHAR except CTLs or ";">
+/// ```
+///
+/// # Example values
+///
+/// * `SID=31d4d96e407aad42`
+/// * `lang=en-US; Expires=Wed, 09 Jun 2021 10:18:14 GMT`
+/// * `lang=; Expires=Sun, 06 Nov 1994 08:49:37 GMT`
+/// * `lang=en-US; Path=/; Domain=example.com`
+///
+/// # Example
+#[derive(Clone, Debug)]
+pub struct SetCookie(Vec<::HeaderValue>);
+
+impl ::Header for SetCookie {
+    fn name() -> &'static ::HeaderName {
+        &::http::header::SET_COOKIE
+    }
+
+    fn decode<'i, I: Iterator<Item = &'i ::HeaderValue>>(values: &mut I) -> Result<Self, ::Error> {
+        let vec = values.cloned().collect::<Vec<_>>();
+
+        if !vec.is_empty() {
+            Ok(SetCookie(vec))
+        } else {
+            Err(::Error::invalid())
+        }
+    }
+
+    fn encode<E: Extend<::HeaderValue>>(&self, values: &mut E) {
+        values.extend(self.0.iter().cloned());
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::super::{test_decode, test_encode};
+    use super::*;
+
+    #[test]
+    fn decode() {
+        let set_cookie = test_decode::<SetCookie>(&["foo=bar", "baz=quux"]).unwrap();
+        assert_eq!(set_cookie.0.len(), 2);
+        assert_eq!(set_cookie.0[0], "foo=bar");
+        assert_eq!(set_cookie.0[1], "baz=quux");
+    }
+
+    #[test]
+    fn encode() {
+        let set_cookie = SetCookie(vec![
+            ::HeaderValue::from_static("foo=bar"),
+            ::HeaderValue::from_static("baz=quux"),
+        ]);
+
+        let headers = test_encode(set_cookie);
+        let mut vals = headers.get_all("set-cookie").into_iter();
+        assert_eq!(vals.next().unwrap(), "foo=bar");
+        assert_eq!(vals.next().unwrap(), "baz=quux");
+        assert_eq!(vals.next(), None);
+    }
+}