how to access original request from onComplete function while processing httpClient response

[oleksandrdarchu]

I am making a few HTTP POSTs to the back-end using JavaScript (httpClient.send) Following anti-pattern guidelines, onComplete() function is used to process the responses.

Things work well until there is an error. For the error response I need to understand what the request was. For instance, second request out of three failed.

Is it possible to access the original request in onComplete function or correlate it somehow?

[dchiesa1 · Accepted solution]

yes, but you need to preserve the request in some way, perhaps with a closure. Like this:

function generateOnComplete(req) {
  return function onComplete(response, error) {
    if ( ! response) {
      throw new Error('request failed');
    }
    if (response.status == 200) {


    }
    else {
      // the variable 'req' here holds the original request
      ...
    }
  };
}


var payload = JSON.stringify({
      foo : 'bar',
      whatever : 1234
    });
var headers = {
      'Content-Type' : 'application/json',
      'Authorization' : 'Bearer xyz'
    };
var url = 'https://example.com/path2';
var req = new Request(url, 'POST', headers, payload);


httpClient.send(req, generateOnComplete(req));

[oleksandrdarchu]

Oh. My mind had been sleeping 😞

Thank you a lot for the response.