message: Use HTTP 1.1 for CurlHttpRequest.
diff: @@ -145,6 +145,8 @@ CurlHttpRequest::CurlHttpRequest(LibCurl* libcurl, Env* env)
  CHECK_CURL_OK(libcurl_->curl_easy_setopt(curl_, CURLOPT_NOSIGNAL, 1L));
  // TODO(b/74351157): Enable HTTP/2.
  + CHECK_CURL_OK(libcurl_->curl_easy_setopt(curl_, CURLOPT_HTTP_VERSION,
  + CURL_HTTP_VERSION_1_1));
  // Set up the progress meter.
  CHECK_CURL_OK(
  