do abort early even with stdclient on bad urls/hosts. allow most same query args on fetchers.

[ldemailly]

• fixes putting an empty or invalid (non resolving) url doesn't abort early - UI and rapi #784

instead of a run with 100% errors

• Also use UI form params for fetch and fetch2 endpoints (so one can pass extra headers with &H=foo:bar and turn off secure fetch using https-insecure=on etc

[codecov]

Codecov Report

Patch coverage: 100.0% and project coverage change: +0.1 🎉

Comparison is base (fc1f4ba) 89.5% compared to head (9a754aa) 89.7%.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #785     +/-   ##
========================================
+ Coverage    89.5%   89.7%   +0.1%     
========================================
  Files          17      17             
  Lines        4086    4141     +55     
========================================
+ Hits         3658    3713     +55     
  Misses        279     279             
  Partials      149     149             

Impacted Files	Coverage Δ
fhttp/http_client.go	85.0% <100.0%> (+0.2%)	⬆️
fhttp/http_forwarder.go	91.0% <100.0%> (+0.8%)	⬆️
fhttp/http_server.go	85.9% <100.0%> (+0.2%)	⬆️
fhttp/http_utils.go	99.2% <100.0%> (+0.1%)	⬆️

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