Execution after HTTP response

Example of code that won't execute after an HTTP response is sent.

Documentation pages that include this code sample

To view the code sample used in context, see the following documentation:

Code sample

C++

#include <google/cloud/functions/http_request.h>
#include <google/cloud/functions/http_response.h>
#include <future>

namespace gcf = ::google::cloud::functions;

gcf::HttpResponse concepts_after_response(
    gcf::HttpRequest /*request*/) {  // NOLINT
  (void)std::async(std::launch::async, [] {
    // This code may fail to complete, or even fail to start at all.
    auto constexpr kIterations = 10;
    int sum = 0;
    for (int i = 0; i != kIterations; ++i) sum += i;
    return sum;
  });
  return gcf::HttpResponse{}.set_payload("Hello World!");
}

Node.js

/**
 * HTTP Cloud Function that may not completely
 * execute due to early HTTP response
 *
 * @param {Object} req Cloud Function request context.
 * @param {Object} res Cloud Function response context.
 */
exports.afterResponse = (req, res) => {
  res.end();

  // This statement may not execute
  console.log('Function complete!');
};

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