Convert http-server output into a mock server

[marc-gr]

Converts the http-server output in a more complete http mock server to allow for more complex use cases.

Closes ##9

[elasticmachine]

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• Build Cause: Pull request #23 updated

• Start Time: 2021-06-07T15:28:16.119+0000

• Duration: 5 min 30 sec

• Commit: 7e20405

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Failed	0
Passed	5
Skipped	0
Total	5

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[P1llus]

LGTM, great work!