I have face this issue with my plugin as describe here;
I observed that plugin is using IDE specific apache http libs rather than bundle customized apache http libs used in my plugin. As I understand what happens here is IDE loads all the artifacts located at <intellij path>/intellij/lib and this will override our customized apache httpclient (No matter even we mentioned in plugin META.INF file). But if we completely replace IntelliJs http client and core jars with our custermizwd httpclient (at <intellij path>/intellij/lib), plugin will work fine. Not sure this will cause any issue for other IntelliJ plugins comes by default if we replaced with our apache httpclient (I think this is not recommended).
Is it possible to ignore IntelliJ http client and use the customized apache http libs used in my plugin. Appreciate you thoughts in this matter.