add x-api-key to fix cors error with api key

[NMathar]

No description provided.

[codecov]

Codecov Report

Base: 70.50% // Head: 70.60% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (ee06638) compared to base (d303482).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head ee06638 differs from pull request most recent head 82219d6. Consider uploading reports for the commit 82219d6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
+ Coverage   70.50%   70.60%   +0.10%     
==========================================
  Files          63       63              
  Lines       12404    12404              
==========================================
+ Hits         8745     8758      +13     
+ Misses       2830     2818      -12     
+ Partials      829      828       -1     

Impacted Files	Coverage Δ
server/rest.go	76.31% <0.00%> (ø)
base/floats/floats_amd64.go	82.45% <0.00%> (+22.80%)	⬆️

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[zhenghaoz]

Thanks for your contribution.