HTTP 200 OK response not working

Question

I am using slack, built a BOT that and subscribed an event message.group I want to build my projects via my BOT, once I post my predefined deploy command it will start execution the script I built, but it will try again and again by self after post a single command.

slack documentation says:

Your app should respond to the event request with an HTTP 2xx within three seconds. If it does not, we'll consider the event delivery attempt failed. After a failure, we'll retry three times, backing off exponentially. We recommend responding to events with a HTTP 200 OK as soon as you can. You may want to avoid processing and reacting to events within the same process handling event reception.

I have set below code at the beginning of my script like this way-

header("HTTP/1.1 200 OK");
echo "HTTP 200 OK";

it dose not work

You should send response with 2xx code to slack service, where is that part of code? — Vahe Galstyan, Jun 13 '17 at 08:13
@VaheGalstyan actually I do not understand how should I send response with 2xx I just printed this code at top of my script `header("HTTP/1.1 200 OK"); echo "HTTP 200 OK";` — mizan3008, Jun 13 '17 at 08:20

score 0 · Answer 1 · answered Jun 13 '17 at 08:24

0

Add Header, and return something

header('HTTP/1.1 200 Success', true, 200);
return 'Success';

answered Jun 13 '17 at 08:24

Vahe Galstyan

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still responding more than one.. :( – mizan3008 Jun 13 '17 at 08:34

score 0 · Answer 2 · answered Jun 13 '17 at 14:23

Responding with HTTP OK to the calling server in the midst of a running PHP script is not trivial. The web server will in most cases prevent any OK sending before the script is terminated. There are two general approaches that will work:

Manage output puffer and force webserver to send OK back (depends on webserver configuration)
Start 2nd script asynchronously to process request further and terminate 1st script within 3 secs. (which will automatically send an HTTP OK back)

See this question for an explanation on how to implement those approaches for Slack in PHP.

See this answer for a solution that worked for me.

if I want to TURNING RETRIES OFF how can I set `X-Slack-No-Retry: 1` as header response? — mizan3008, Jun 14 '17 at 07:00

HTTP 200 OK response not working

2 Answers2