enable connection reuse in libcurl #80
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Originally, in the `HttpClient::perform()` method, a new `CurlHandle` was created upon every invocation, leading to subsequent calls to `curl_easy_init()` and `curl_easy_cleanup()`, as the variable went in and out of scope while it executed on the `asio::thread_pool`. This meant that there was no opportunity to reuse connections from the underlying connection pool, because it was always cleaned up. By marking the `CurlHandle` with the `thread_local` storage duration, it ensures that the same one remains in use for each thread, thus providing the means to reuse the established connection pool. Fixes Netflix-Skunkworks#51.
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Originally, in the
HttpClient::perform()method, a newCurlHandlewas createdupon every invocation, leading to subsequent calls to
curl_easy_init()andcurl_easy_cleanup(), as the variable went in and out of scope while it executedon the
asio::thread_pool. This meant that there was no opportunity to reuseconnections from the underlying connection pool, because it was always cleaned up.
By marking the
CurlHandlewith thethread_localstorage duration, it ensuresthat the same one remains in use for each thread, thus providing the means to
reuse the established connection pool.
Fixes #51.