Brotli support (#791)

tests/gzip.rs

@@ -41,7 +41,10 @@ async fn test_gzip_empty_body() {
 async fn test_accept_header_is_not_changed_if_set() {
     let server = server::http(move |req| async move {
         assert_eq!(req.headers()["accept"], "application/json");
-        assert_eq!(req.headers()["accept-encoding"], "gzip");
+        assert!(req.headers()["accept-encoding"]
+            .to_str()
+            .unwrap()
+            .contains("gzip"));
         http::Response::default()
     });
 
@@ -111,7 +114,10 @@ async fn gzip_case(response_size: usize, chunk_size: usize) {
     response.extend(&gzipped_content);
 
     let server = server::http(move |req| {
-        assert_eq!(req.headers()["accept-encoding"], "gzip");
+        assert!(req.headers()["accept-encoding"]
+            .to_str()
+            .unwrap()
+            .contains("gzip"));
 
         let gzipped = gzipped_content.clone();
         async move {