Support HTTP GET

[bradjones1]

Fixes #343

[codecov]

Codecov Report

❌ Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.59%. Comparing base (0348af2) to head (9fba141).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
src/transports/HTTPTransport.ts	80.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #344      +/-   ##
==========================================
- Coverage   99.27%   98.59%   -0.69%     
==========================================
  Files          11       11              
  Lines         416      428      +12     
  Branches       64       67       +3     
==========================================
+ Hits          413      422       +9     
- Misses          3        6       +3     

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