Labels file type

[WeTurkstra]

Description

Ability to request a different file type then the default pdf by overrideing the default accept header.

Motivation and context

Currently the accept header is set to application/pdf and i want to be able to request zpl files using the header value application/zpl

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• 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.

Please, please, please, don't send your pull request until all of the boxes are ticked.

• I have read the CONTRIBUTING document.
• My pull request addresses exactly one patch/feature.
• I have created a branch for this patch/feature.
• Each individual commit in the pull request is meaningful.
• [] I have added tests to cover my changes.
• All new and existing tests passed.
• If my change requires a change to the documentation, I have updated it accordingly.
• My code follows the code style of this project.

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