feat(client): add proxy::matcher utilities

A builder for configuring a matcher, as well as the ability to create
one from standard environment variables.

Author: seanmonstar

Cargo.toml

@@ -18,13 +18,16 @@ features = ["full"]
 rustdoc-args = ["--cfg", "docsrs"]
 
 [dependencies]
-hyper = "1.6.0"
+base64 = { version = "0.22", optional = true }
+bytes = "1.7.1"
+futures-channel = { version = "0.3", optional = true }
 futures-util = { version = "0.3.16", default-features = false }
 http = "1.0"
 http-body = "1.0.0"
-bytes = "1.7.1"
+hyper = "1.6.0"
+ipnet = { version = "2.9", optional = true }
+percent-encoding = { version = "2.3", optional = true }
 pin-project-lite = "0.2.4"
-futures-channel = { version = "0.3", optional = true }
 socket2 = { version = "0.5.9", optional = true, features = ["all"] }
 tracing = { version = "0.1", default-features = false, features = ["std"], optional = true }
 tokio = { version = "1", optional = true, default-features = false  }
@@ -61,6 +64,7 @@ full = [
 
 client = ["hyper/client", "dep:tracing", "dep:futures-channel", "dep:tower-service"]
 client-legacy = ["client", "dep:socket2", "tokio/sync", "dep:libc"]
+client-proxy-env = ["client", "dep:base64", "dep:ipnet", "dep:percent-encoding"]
 
 server = ["hyper/server"]
 server-auto = ["server", "http1", "http2"]

src/client/mod.rs

@@ -3,3 +3,7 @@
 /// Legacy implementations of `connect` module and `Client`
 #[cfg(feature = "client-legacy")]
 pub mod legacy;
+
+// for now, no others features use this mod
+//#[cfg(feature = "client-proxy-env")]
+pub mod proxy;