use idenity encoding on client if no compression features are enabled

CHANGES.md

@@ -1,10 +1,15 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
-* Implement Logger middleware regex exclude pattern [#1723]
 
+* Implement Logger middleware regex exclude pattern [#1723]
 [#1723]: https://github.com/actix/actix-web/pull/1723
 
+### Fixed
+
+* awc now uses `Accept-Encoding: identity` instead of `Accept-Encoding: br` when no compression feature is enabled
+[#1737](https://github.com/actix/actix-web/pull/1737)
+
 ## 3.1.0 - 2020-09-29
 ### Changed
 * Add `TrailingSlash::MergeOnly` behaviour to `NormalizePath`, which allows `NormalizePath`

awc/Cargo.toml

@@ -44,6 +44,7 @@ actix-rt = "1.0.0"
 
 base64 = "0.12"
 bytes = "0.5.3"
+cfg-if = "1.0"
 derive_more = "0.99.2"
 futures-core = { version = "0.3.5", default-features = false }
 log =" 0.4"

awc/src/request.rs

@@ -21,10 +21,15 @@ use crate::frozen::FrozenClientRequest;
 use crate::sender::{PrepForSendingError, RequestSender, SendClientRequest};
 use crate::ClientConfig;
 
-#[cfg(any(feature = "flate2-zlib", feature = "flate2-rust"))]
-const HTTPS_ENCODING: &str = "br, gzip, deflate";
-#[cfg(not(any(feature = "flate2-zlib", feature = "flate2-rust")))]
-const HTTPS_ENCODING: &str = "br";
+cfg_if::cfg_if! {
+    if #[cfg(any(feature = "flate2-zlib", feature = "flate2-rust"))] {
+        const HTTPS_ENCODING: &str = "br, gzip, deflate";
+    } else if #[cfg(feature = "compress")] {
+        const HTTPS_ENCODING: &str = "br";
+    } else {
+        const HTTPS_ENCODING: &str = "identity";
+    }
+}
 
 /// An HTTP Client request builder
 ///