Nginx – How to insert a delay in response with nginx

nginx

I have a fast-cgi application that do some work at http://myapp.com/do?arg=x. The job may take a few minutes. So I want to keep redirecting the users to the same URL (with 307) until the job is done, and serve the results with a 200 OK. I would like to slow done the response rate, so that it takes the client 30s (for example) to receive a 307. Obviously, I don't want to do in the back-end because I need to handle other jobs. It is possible to tell nginx to insert a delay, or rate limit the response for a particular URL?

I've looked at limit_req, but I don't think it can be used to rate limit unique URLS (http://myapp.com/do?arg=x versus http://myapp.com/do?arg=y) but rather unique IP addresses.

Best Answer

You might want to restructure your application to better handle the situation. I would have two scripts: one is the web page the user hits. The second is a back end script that dose the job.

Script two can be a daemon, or you can use non-blocking forking if your environment supports it from script one. Script one should initiate the job in script two, then push data to the user using something like EventStream (or WebSockets, although thats a major overkill here) updating them of the status. You can send a 200 or some other indication when your done.

Correct way in new versions of nginx

Turn out my first answer to this question was correct at certain time, but it turned into another pitfall - to stay up to date please check Taxing rewrite pitfalls

I have been corrected by many SE users, so the credit goes to them, but more importantly, here is the correct code:

server {
       listen         80;
       server_name    my.domain.com;
       return         301 https://$server_name$request_uri;
}

server {
       listen         443 ssl;
       server_name    my.domain.com;
       # add Strict-Transport-Security to prevent man in the middle attacks
       add_header Strict-Transport-Security "max-age=31536000" always; 

       [....]
}

Nginx – How to see which flags Nginx was compiled with

nginx -V will list all the configured modules. There is no explicit enable/load command.

Best Answer

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Correct way in new versions of nginx

Nginx – How to see which flags Nginx was compiled with

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