add Proxy::basic_auth support

Closes #322

tests/proxy.rs

@@ -4,7 +4,7 @@ extern crate reqwest;
 mod support;
 
 #[test]
-fn test_http_proxy() {
+fn http_proxy() {
     let server = server! {
         request: b"\
             GET http://hyper.rs/prox HTTP/1.1\r\n\
@@ -37,3 +37,43 @@ fn test_http_proxy() {
     assert_eq!(res.status(), reqwest::StatusCode::OK);
     assert_eq!(res.headers().get(reqwest::header::SERVER).unwrap(), &"proxied");
 }
+
+#[test]
+fn http_proxy_basic_auth() {
+    let server = server! {
+        request: b"\
+            GET http://hyper.rs/prox HTTP/1.1\r\n\
+            user-agent: $USERAGENT\r\n\
+            accept: */*\r\n\
+            accept-encoding: gzip\r\n\
+            proxy-authorization: Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==\r\n\
+            host: hyper.rs\r\n\
+            \r\n\
+            ",
+        response: b"\
+            HTTP/1.1 200 OK\r\n\
+            Server: proxied\r\n\
+            Content-Length: 0\r\n\
+            \r\n\
+            "
+    };
+
+    let proxy = format!("http://{}", server.addr());
+
+    let url = "http://hyper.rs/prox";
+    let res = reqwest::Client::builder()
+        .proxy(
+            reqwest::Proxy::http(&proxy)
+            .unwrap()
+            .basic_auth("Aladdin", "open sesame")
+        )
+        .build()
+        .unwrap()
+        .get(url)
+        .send()
+        .unwrap();
+
+    assert_eq!(res.url().as_str(), url);
+    assert_eq!(res.status(), reqwest::StatusCode::OK);
+    assert_eq!(res.headers().get(reqwest::header::SERVER).unwrap(), &"proxied");
+}