Fix panic on unknown content encoding

CHANGES.md

@@ -1,5 +1,9 @@
 # Changes
 
+## 0.4.7 (2018-03-xx)
+
+* Fix panic on unknown content encoding
+
 ## 0.4.6 (2018-03-10)
 
 * Fix client cookie handling

src/header/mod.rs

@@ -165,8 +165,7 @@ impl<'a> From<&'a str> for ContentEncoding {
             "br" => ContentEncoding::Br,
             "gzip" => ContentEncoding::Gzip,
             "deflate" => ContentEncoding::Deflate,
-            "identity" => ContentEncoding::Identity,
-            _ => ContentEncoding::Auto,
+            _ => ContentEncoding::Identity,
         }
     }
 }

src/server/encoding.rs

@@ -466,8 +466,8 @@ impl ContentEncoder {
                 GzEncoder::new(transfer, Compression::default())),
             ContentEncoding::Br => ContentEncoder::Br(
                 BrotliEncoder::new(transfer, 5)),
-            ContentEncoding::Identity => ContentEncoder::Identity(transfer),
-            ContentEncoding::Auto => unreachable!()
+            ContentEncoding::Identity | ContentEncoding::Auto =>
+                ContentEncoder::Identity(transfer),
         }
     }