[DS1-1] Fix response parsing issue on ServerRecipeGenerator

[edykim]

• Added test case with a failing content response
• Fixed content response handling

While testing, found some response does not parse correctly, even though there is a proper response. It occurs about 1 in every 3 to 4 attempts.

The causing issue is that HttpURLConnection passes the normal response in ErrorStream not in InputStream some reason. I assumed that some character set issue but not sure the causing issue because we uses same structure on every request/response. We get ErrorStream data if InputStream returns nothing for now.

Close #226

[github-actions[bot]]

Code Coverage

Overall Project	76.18% -0.42%	:green_apple:
Files changed	16%	:x:

File	Coverage
ServerRecipeGenerator.java	89.77% -7.95%	:x: