relax response parsing

fixes #2103

actix-http/CHANGES.md

@@ -1,6 +1,10 @@
 # Changes
 
 ## Unreleased - 2021-xx-xx
+### Fixed
+- Allow spaces between header name and colon when parsing responses. [#2684]
+
+[#2684]: https://github.com/actix/actix-web/issues/2684
 
 
 ## 3.0.2 - 2022-03-05

actix-http/src/h1/decoder.rs

@@ -295,8 +295,11 @@ impl MessageType for ResponseHead {
         let (len, ver, status, h_len) = {
             let mut parsed: [httparse::Header<'_>; MAX_HEADERS] = EMPTY_HEADER_ARRAY;
 
+            let mut config = httparse::ParserConfig::default();
+            config.allow_spaces_after_header_name_in_responses(true);
+
             let mut res = httparse::Response::new(&mut parsed);
-            match res.parse(src)? {
+            match config.parse_response(&mut res, src)? {
                 httparse::Status::Complete(len) => {
                     let version = if res.version.unwrap() == 1 {
                         Version::HTTP_11

awc/src/request.rs

@@ -505,7 +505,7 @@ impl fmt::Debug for ClientRequest {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         writeln!(
             f,
-            "\nClientRequest {:?} {}:{}",
+            "\nClientRequest {:?} {} {}",
             self.head.version, self.head.method, self.head.uri
         )?;
         writeln!(f, "  headers:")?;