Make responses RESTFUL

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 72.72727% with 6 lines in your changes missing coverage. Please review.

Project coverage is 97.67%. Comparing base (2f7431a) to head (55498ee). Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
...spring/security/filter/ExceptionHandlerFilter.java	50.00%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #485 +/- ## ============================================ - Coverage 98.07% 97.67% -0.40% Complexity 229 229 ============================================ Files 78 78 Lines 1402 1421 +19 Branches 46 46 ============================================ + Hits 1375 1388 +13 - Misses 22 28 +6 Partials 5 5 ``` | [Flag](https://app.codecov.io/gh/GeoZac/unconv_spring/pull/485/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Zacharia) | Coverage Δ | | |---|---|---| | [controllers_test](https://app.codecov.io/gh/GeoZac/unconv_spring/pull/485/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Zacharia) | `97.67% <72.72%> (-0.40%)` | :arrow_down: | | [integration_test](https://app.codecov.io/gh/GeoZac/unconv_spring/pull/485/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Zacharia) | `97.67% <72.72%> (-0.40%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=George+Zacharia#carryforward-flags-in-the-pull-request-comment) to find out more.

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[sonarcloud[bot]]

Quality Gate failed

Failed conditions
72.7% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud