cwclientlib #5496169 proxy.base_url can contain "//" [validation pending]

If an endpoint's url contains a path, as in, the proxy's base_url will be it will be used as is to generate the signature.

On the server-side, the "//" will be wiped away and the expected signature will therefore differ.

done in0.3.1
load left0.000
closed by#9a22112e09ea avoid double '/' in proxy base_url (closes #5496169)
patchavoid double '/' in proxy base_url (closes #5496169) [applied]