API: better test for server compatibility
API: better test for server compatibility

https://github.com/marienfressinaud/FreshRSS/issues/443

romibi/FreshRSS,asmundg/FreshRSS,Alkarex/FreshRSS,Alkarex/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,samuelstein/FreshRSS,asmundg/FreshRSS,romibi/FreshRSS,Dolomich/FreshRSS,superboum/FreshRSS,asmundg/FreshRSS,romibi/FreshRSS,marienfressinaud/FreshRSS,samuelstein/FreshRSS,FreshRSS/FreshRSS,plopoyop/FreshRSS,aledeg/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,marienfressinaud/FreshRSS,superboum/FreshRSS,samuelstein/FreshRSS,Dolomich/FreshRSS,romibi/FreshRSS,aledeg/FreshRSS,FreshRSS/FreshRSS,plopoyop/FreshRSS,superboum/FreshRSS,marienfressinaud/FreshRSS,Alkarex/FreshRSS,Dolomich/FreshRSS,aledeg/FreshRSS,Alkarex/FreshRSS