Guild Wars 2

I found a bug with the errors returned for bad pagination requests – they don’t match the “standard” format returned for other errors.
Pagination errors:

{"text":"page out of range. Use page values 0 - 191."}
{"text":"page_size out of range. Use page_size values 1 - 200."}

Standard errors:

{"error":10,"product":0,"module":2,"line":427,"text":"invalid item_id"}
{"error":90,"product":71,"module":2,"line":378,"text":"CnConn: language not supported"}

My v1 code was relying on the presence of the “error” attribute to detect request errors. Would it be possible to standardize the pagination errors – at least give them an “error” attribute?

The error code is useful to determine which parameter was invalid.

10 = invalid identifier
90 = invalid language

You could then use that information to do things like display localized error information, which is useful because error responses are always in English regardless of the given ‘lang’ parameter.

https://forum-en.gw2archive.eu/forum/community/api/Return-proper-error-codes/first#post2961806

API v1 was originally using non-informative HTTP codes, so I wrote my module to look at the returned JSON instead. I never bothered updating it after Stefan’s changes because my method “just worked.” I guess I’ll have to update now.