Add proxy support for oauth1_config class

Release/include/cpprest/oauth1.h

@@ -28,6 +28,7 @@
 #define _CASA_OAUTH1_H
 
 #include "cpprest/http_msg.h"
+#include "cpprest/details/web_utilities.h"
 
 namespace web
 {
@@ -479,6 +480,24 @@ class oauth1_config
     /// </summary>
     void clear_parameters() { m_parameters_to_sign.clear(); }
 
+    /// <summary>
+    /// Get the web proxy object
+    /// </summary>
+    /// <returns>A reference to the web proxy object.</returns>
+    const web_proxy& proxy() const
+    {
+        return m_proxy;
+    }
+
+    /// <summary>
+    /// Set the web proxy object that will be used by token_from_code and token_from_refresh
+    /// </summary>
+    /// <param name="proxy">A reference to the web proxy object.</param>
+    void set_proxy(const web_proxy& proxy)
+    {
+        m_proxy = proxy;
+    }
+
 private:
     friend class web::http::client::http_client_config;
     friend class web::http::oauth1::details::oauth1_handler;
@@ -532,6 +551,8 @@ class oauth1_config
 
 	std::map<utility::string_t, utility::string_t> m_parameters_to_sign;
 
+    web::web_proxy m_proxy;
+
     utility::nonce_generator m_nonce_generator;
     bool m_is_authorization_completed;
 };

Release/src/http/oauth/oauth1.cpp

@@ -29,6 +29,7 @@
 
 using namespace utility;
 using web::http::client::http_client;
+using web::http::client::http_client_config;
 using web::http::oauth1::details::oauth1_state;
 using web::http::oauth1::details::oauth1_strings;
 
@@ -281,7 +282,13 @@ pplx::task<void> oauth1_config::_request_token(oauth1_state state, bool is_temp_
     req._set_base_uri(endpoint);
 
     _authenticate_request(req, std::move(state));
-    http_client client(endpoint);
+
+    // configure proxy
+    http_client_config config;
+    config.set_proxy(m_proxy);
+
+    http_client client(endpoint, config);
+
     return client.request(req)
     .then([](http_response resp)
     {