allow proxy middleware to pass rewritten query part (fix #1798)

[aldas]

Alow proxy middleware to pass rewritten query part (fix #1798)

[codecov]

Codecov Report

Merging #1802 (a8f02c8) into master (a97052e) will decrease coverage by 0.19%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master    #1802      +/-   ##
==========================================
- Coverage   89.68%   89.49%   -0.20%     
==========================================
  Files          32       32              
  Lines        2676     2684       +8     
==========================================
+ Hits         2400     2402       +2     
- Misses        178      181       +3     
- Partials       98      101       +3     

Impacted Files	Coverage Δ
middleware/proxy.go	60.46% <0.00%> (-1.89%)	⬇️
middleware/rewrite.go	64.70% <0.00%> (-11.77%)	⬇️
middleware/middleware.go	94.44% <88.88%> (-5.56%)	⬇️

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[lammel]

You thought of more tests then I did definitely ;-)
Please add the comment as requested just to note that the leftmost part of the URL will be trimmed if replacement and original URL share the same prefix.

Approved. Feel free to merge.

[lammel]

As noted in #1798 the problem is resolved with this PR.
Comment added, so merging.