Generate config_flags for http proxy

[ByronHsu]

TL;DR

In #405, I somehow missed a piece when generating. This pr i do make generate, and add it back.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

[codecov]

Codecov Report

Merging #411 (da776e6) into master (e718afd) will increase coverage by 2.55%.
The diff coverage is n/a.

❗ Current head da776e6 differs from pull request most recent head db595dc. Consider uploading reports for the commit db595dc to get more accurate results

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
+ Coverage   75.92%   78.48%   +2.55%     
==========================================
  Files          18       18              
  Lines        1458     1250     -208     
==========================================
- Hits         1107      981     -126     
+ Misses        294      212      -82     
  Partials       57       57              

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see 18 files with indirect coverage changes

[hamersaw]

@wild-endeavor was this fixed by another PR? Can we close this?