Add a missing source file; update README.

webcc/http_request_builder.cc

@@ -0,0 +1,52 @@
+#include "webcc/http_request_builder.h"
+
+#include "webcc/logger.h"
+#include "webcc/zlib_wrapper.h"
+
+namespace webcc {
+
+HttpRequestPtr HttpRequestBuilder::operator()() {
+  assert(parameters_.size() % 2 == 0);
+  assert(headers_.size() % 2 == 0);
+
+  auto request = std::make_shared<HttpRequest>(method_, url_);
+
+  for (std::size_t i = 1; i < parameters_.size(); i += 2) {
+    request->AddParameter(parameters_[i - 1], parameters_[i]);
+  }
+
+  for (std::size_t i = 1; i < headers_.size(); i += 2) {
+    request->SetHeader(std::move(headers_[i - 1]), std::move(headers_[i]));
+  }
+
+  // No keep-alive?
+  if (!keep_alive_) {
+    request->SetHeader(http::headers::kConnection, "Close");
+  }
+
+  if (!data_.empty()) {
+    if (gzip_ && data_.size() > kGzipThreshold) {
+      std::string compressed;
+      if (Compress(data_, &compressed)) {
+        request->SetContent(std::move(compressed), true);
+        request->SetHeader(http::headers::kContentEncoding, "gzip");
+      } else {
+        LOG_WARN("Cannot compress the content data!");
+        request->SetContent(std::move(data_), true);
+      }
+    } else {
+      request->SetContent(std::move(data_), true);
+    }
+
+    // TODO: Request-level charset.
+    if (json_) {
+      request->SetContentType(http::media_types::kApplicationJson, "");
+    }
+  }
+
+  request->set_buffer_size(buffer_);
+
+  return request;
+}
+
+}  // namespace webcc