Fix 100 Continue

A 100 Continue response is an HTTP message in its own right, and must therefore be correctly delineated from the actual response by \r\n\r\n. curl will fail with the current code, as it cannot decode the two HTTP messages correctly.

Author: VShell

src/server/decode.rs

@@ -128,7 +128,7 @@ fn url_from_httparse_req(req: &httparse::Request<'_, '_>) -> http_types::Result<
 }
 
 const EXPECT_HEADER_VALUE: &str = "100-continue";
-const EXPECT_RESPONSE: &[u8] = b"HTTP/1.1 100 Continue\r\n";
+const EXPECT_RESPONSE: &[u8] = b"HTTP/1.1 100 Continue\r\n\r\n";
 
 async fn handle_100_continue<IO>(req: &Request, io: &mut IO) -> http_types::Result<()>
 where
@@ -223,7 +223,7 @@ mod tests {
         let result = async_std::task::block_on(handle_100_continue(&request, &mut io));
         assert_eq!(
             std::str::from_utf8(&io.into_inner()).unwrap(),
-            "HTTP/1.1 100 Continue\r\n"
+            "HTTP/1.1 100 Continue\r\n\r\n"
         );
         assert!(result.is_ok());
     }