Server content type response and escaping slashes

[bbrala]

Description

Server did not repsond with correct header, and slashes inside links were escaped by json encode.

Motivation and context

Comply with spec, and remove escaping.

How has this been tested?

Tests for headers are added, response tested in test project.

Types of changes

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• 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 change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply.

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• I have added tests to cover my changes.
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