Fix http_response_header deprecation in installer

[bwoebi]

Fixes #3522.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.64%. Comparing base (595708d) to head (99477d5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3553      +/-   ##
==========================================
- Coverage   61.78%   61.64%   -0.14%     
==========================================
  Files         139      139              
  Lines       13051    13051              
  Branches     1712     1712              
==========================================
- Hits         8063     8045      -18     
- Misses       4225     4241      +16     
- Partials      763      765       +2     

see 4 files with indirect coverage changes

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