fix(confighttp): do not return 200 on errors

[ReenigneArcher]

Description

• Return 400 status code on config API errors
• Add default_resource for requests that are not GET
• Remove trailing commas in API examples
• Clarify how index works when saving an app
• Change xml responses to json
• Add grouped tab code examples to API docs

TODO:

• add tabbed examples for each endpoint in docs. e.g. curl, python, javascript, powershell
• trying to delete app way out of index range shows as success

  >curl -u user:pass -X DELETE -k https://localhost:47990/api/apps/5000
  {
      "status": "true"
  }
  

  Note: existing check was useless since it could never actually be fired ( < 0 is not possible due to the regex of the endpoint), instead changed it to a clamp and checked the upper bounds.

Screenshot

Issues Fixed or Closed

• Fixes Beta API: POST /api/apps returns 200 OK on invalid input JSON #3384

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 56 lines in your changes missing coverage. Please review.

Project coverage is 6.17%. Comparing base (6a233cb) to head (d945065).

Files with missing lines	Patch %	Lines
src/confighttp.cpp	0.00%	56 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3385      +/-   ##
=========================================
- Coverage    8.44%   6.17%   -2.27%     
=========================================
  Files          90      66      -24     
  Lines       16074   12002    -4072     
  Branches     7636    5602    -2034     
=========================================
- Hits         1357     741     -616     
+ Misses      12237   11084    -1153     
+ Partials     2480     177    -2303     

Flag	Coverage Δ
Linux	?
Windows	6.17% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/confighttp.cpp	0.00% <0.00%> (ø)

... and 56 files with indirect coverage changes

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 New issue
1 New Code Smells (required ≤ 0)

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