remove accept_ member var from request builder

examples/client_basics.cc

@@ -8,6 +8,7 @@ int main() {
   WEBCC_LOG_INIT("", webcc::LOG_CONSOLE);
 
   webcc::ClientSession session;
+
   session.Accept("application/json");
 
   webcc::ResponsePtr r;

webcc/request_builder.cc

@@ -22,10 +22,6 @@ RequestPtr RequestBuilder::operator()() {
     request->SetHeader(std::move(headers_[i - 1]), std::move(headers_[i]));
   }
 
-  if (!accept_.empty()) {
-    request->SetHeader(headers::kAccept, std::move(accept_));
-  }
-
   // If no Keep-Alive, explicitly set `Connection` to "Close".
   if (!keep_alive_) {
     request->SetHeader(headers::kConnection, "Close");

webcc/request_builder.h

@@ -117,10 +117,10 @@ public:
     return *this;
   }
 
-  // Set content types to accept.
+  // Set (comma separated) content types to accept.
+  // E.g., "application/json", "text/html, application/xhtml+xml".
   RequestBuilder& Accept(const std::string& content_types) {
-    accept_ = content_types;
-    return *this;
+    return Header(headers::kAccept, content_types);
   }
 
   RequestBuilder& Body(const std::string& data) {
@@ -195,10 +195,6 @@ private:
   // E.g., "utf-8".
   std::string charset_;
 
-  // Accept content types (could be comma separated multiple types).
-  // E.g., "application/json", "text/html, application/xhtml+xml".
-  std::string accept_;
-
   // Files to upload for a POST request.
   std::vector<FormPartPtr> form_parts_;