Hooking error pages to add CORS header.

[millipedia]

We're building a Capacitor app that grabs data from the OpenAI API via ProcessWire (it's a fun project - I'll write it up once it's done).

For successful requests we're adding a CORS header:

    header('Access-Control-Allow-Origin: *');
    header('Content-Type: application/json');

and that's all good.

Occasionally though we'll get a timeout form OpenAI (or I've done something daft in the code) and PW will throw a 500 error.

Because that response doesn't have the correct headers then I can't catch the error in the app.

I've tired adding the header into

wire()->addHookBefore('Page::errorPage', function($event) {

but I'm not convinced that 500 errors even get there.

Suggestions as to how I can a header gratefully received....

 

[BitPoet]

Well, best practice would be to make sure that your api request times out before your PHP script does (WireHttp::setTimeout / curl_setopt(CURLOPT_TIMEOUT, xx) / curl_setopt(CURLOPT_CONNECTTIMEOUT, yy) vs. max_execution_time & site_time_limit).

You can of course set the header through .htaccess instead of PHP (mod_headers must be enabled of course):

Header always set Access-Control-Allow-Origin: "*"

The keyword "always" also sends the header with redirects.

[millipedia]

Great - that's really useful. I didn't know about the 'always' condition in .htaccess (even though it's all over the place in the usual .htaccess file ....).

I think a combination of that and catching my errors earlier should do me.

Thanks for your help.