add content-length header

[olegbaturin]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.68%. Comparing base (13bba5f) to head (d1ceffe).
⚠️ Report is 18 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #105      +/-   ##
============================================
+ Coverage     99.66%   99.68%   +0.01%     
- Complexity      108      113       +5     
============================================
  Files            13       13              
  Lines           298      313      +15     
============================================
+ Hits            297      312      +15     
  Misses            1        1              

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