add query parameters example

README.md

@@ -30,6 +30,7 @@
 - Custom headers
 - Asynchronous requests
 - Different types of timeouts
+- URL encoded query parameters
 - Completion and progress callbacks
 - Custom uploading and downloading streams
 - PUT, GET, HEAD, POST, PATCH, DELETE, OPTIONS methods
@@ -128,6 +129,20 @@ std::cout << "Content Length: " << response.headers["content-length"] << std::en
 // Content Length: 389
 ```
 
+### Query Parameters
+
+```cpp
+auto request = net::request_builder()
+    .url("http://httpbin.org/anything")
+    .qparam("hello", "world")
+    .send();
+
+auto response = request.take();
+std::cout << "Last URL: " << response.last_url() << std::endl;
+
+// Last URL: http://httpbin.org/anything?hello=world
+```
+
 ### Error Handling
 
 ```cpp

headers/curly.hpp/curly.hpp

@@ -185,13 +185,18 @@ namespace curly_hpp
         response(const response&) = delete;
         response& operator=(const response&) = delete;
 
-        explicit response(http_code_t c) noexcept
+        explicit response(std::string u, http_code_t c) noexcept
-        : http_code_(c) {}
+        : last_url_(u)
+        , http_code_(c) {}
 
         bool is_http_error() const noexcept {
             return http_code_ >= 400u;
         }
 
+        const std::string& last_url() const noexcept {
+            return last_url_;
+        }
+
         http_code_t http_code() const noexcept {
             return http_code_;
         }
@@ -202,6 +207,7 @@ namespace curly_hpp
         downloader_uptr downloader;
         progressor_uptr progressor;
     private:
+        std::string last_url_;
         http_code_t http_code_{0u};
     };
 }

sources/curly.hpp/curly.cpp

@@ -439,6 +439,17 @@ namespace curly_hpp
                 return false;
             }
 
+            char* last_url = nullptr;
+            if ( CURLE_OK != curl_easy_getinfo(
+                curlh_.get(),
+                CURLINFO_EFFECTIVE_URL,
+                &last_url) || !last_url )
+            {
+                status_ = req_status::failed;
+                cvar_.notify_all();
+                return false;
+            }
+
             long http_code = 0;
             if ( CURLE_OK != curl_easy_getinfo(
                 curlh_.get(),
@@ -451,7 +462,7 @@ namespace curly_hpp
             }
 
             try {
-                response_ = response(static_cast<http_code_t>(http_code));
+                response_ = response(last_url, static_cast<http_code_t>(http_code));
                 response_.content = std::move(response_content_);
                 response_.headers = std::move(response_headers_);
                 response_.uploader = std::move(breq_.uploader());

untests/curly_tests.cpp

@@ -179,6 +179,7 @@ TEST_CASE("curly") {
             auto resp = req.take();
             REQUIRE(req.status() == net::req_status::empty);
             REQUIRE(resp.http_code() == 204u);
+            REQUIRE(resp.last_url() == "https://httpbin.org/status/204");
         }
         {
             auto req = net::request_builder("https://httpbin.org/delay/2").send();
@@ -484,6 +485,7 @@ TEST_CASE("curly") {
                 .qparams(qparams.begin(), qparams.end())
                 .send();
             const auto resp = req.take();
+            REQUIRE(resp.last_url() == "https://httpbin.org/response-headers?hello=world&world=hello");
             const auto content_j = json_parse(resp.content.as_string_view());
             REQUIRE(content_j["hello"] == "world");
             REQUIRE(content_j["world"] == "hello");
@@ -971,6 +973,18 @@ TEST_CASE("curly_examples") {
         // Content Length: 389
     }
 
+    SECTION("Query Parameters") {
+        auto request = net::request_builder()
+            .url("http://httpbin.org/anything")
+            .qparam("hello", "world")
+            .send();
+
+        auto response = request.take();
+        std::cout << "Last URL: " << response.last_url() << std::endl;
+
+        // Last URL: http://httpbin.org/anything?hello=world
+    }
+
     SECTION("Error Handling") {
         auto request = net::request_builder()
             .url("http://unavailable.site.com")