add parsing and fetching server requests

[ninedraft]

• Add IncomingRequest.Certificates() method

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.21 🎉

Comparison is base (2fe9c69) 70.17% compared to head (f173401) 71.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   70.17%   71.39%   +1.21%     
==========================================
  Files           8        8              
  Lines         389      395       +6     
==========================================
+ Hits          273      282       +9     
+ Misses         95       93       -2     
+ Partials       21       20       -1     

Flag	Coverage Δ
unittests	71.39% <100.00%> (+1.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
gemax/request.go	92.00% <100.00%> (+0.16%)	⬆️
gemax/server.go	85.29% <100.00%> (+0.75%)	⬆️

... and 1 file with indirect coverage changes

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