[QGIS-Developer] Proxy configuration in plugin

[Etienne Trimaille]

The proxy settings are only set up for core class in QGIS, which you should
look at to make your requests.
CF
https://gis.stackexchange.com/questions/343126/how-to-perform-sync-or-async-network-request-in-pyqgis

If you really want to use "requests", you should read the QgsSettings about
proxy and use these values in requests as well.
Similar to
https://stackoverflow.com/questions/23041066/setting-proxy-parameter-in-qgis-plugins-how-to/37757921#37757921

Le jeu. 21 janv. 2021 à 15:03, Sampo Savolainen <
sampo.savolainen at spatineo.com> a écrit :

> Hi,
>
> I'm developing a small QGIS plugin (
> https://github.com/spatineo/qgis-intelligent-search/) and ran into issues
> with proxy configuration. The plugin uses the Python requests library to
> make HTTP API calls and owslib to download and parse GetCapabilities
> documents from WxS services. Owslib seems to use the same requests library
> to make HTTP calls. However proxies are (unsurprisingly) giving us
> headaches.
>
> We have tested the plugin in two environments where proxies are required
> to make HTTP requests. The environments had different versions of QGIS:
> 3.14 and 3.10, both in Windows. The first environment (newer version) is
> able to make the API calls using the requests library, but owslib fails to
> connect to services. The older version of QGIS fails to connect to the API
> and the owslib part never gets tested. Note that this discrepancy may be
> related to the API being available without a proxy in the first
> environment  - though this is just a suspicion, I have been unable to
> confirm this.
>
> With 3.10, I've tried QGIS proxy configuration both as "DefaultProxy" (use
> system config) and as "HttpProxy" but neither one helped. However I was
> able to make it work by setting the http_proxy and https_proxy environment
> variables in a shell and launching QGIS from that shell.
>
> So this seems to boil down to the QGIS proxy settings are not passed to
> the plugin via http_proxy and https_proxy environment variables. Is there a
> best practice on how plugins should access proxy configuration in QGIS and
> use it?
>
>
>  Thanks,
>  Sampo
>
> --
> Sampo Savolainen
> Managing Director
> Työpajankatu 9 D, 00580 Helsinki, Finland
> www.spatineo.com
> Tel. +358 40 7555 649
>
>
>
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