IFrame requests don't work properly

[mbollmann]

Originally reported by: Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann)

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At some point, requests made using iframes stopped working properly (the response text isn't pure JSON anymore).

Maybe the "Content-Type: application/json" header is responsible?

Either...

• drop the header for requests that use iFrames (seems hacky); or
• change the iFrame requests to normal ones (drawbacks?).

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• Bitbucket: https://bitbucket.org/mbollmann/cora/issue/16

[mbollmann]

Original comment by Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann):

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Fix #16

Handling of iFrame responses could be refactored into something nicer, but this will do for now.

[mbollmann]

Original comment by Marcel Bollmann (Bitbucket: mbollmann, GitHub: mbollmann):

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Iframes render their response in an invisible browser frame (hence the name), for which "application/json" apparently isn't a valid content type.

Suggestion:

• All iframe requests send an additional parameter (e.g. via=iframe) identifying themselves
• Server chooses Content-Type depending on whether this parameter is present
• Maybe also wrap the response in an HTML tag (<textarea> or <pre>?) to make sure the browser doesn't mangle the content in any way, and change the JavaScript that parses the iframe response accordingly