Support application/xhtml+xml content-type in cy.visit() command

[vodlogic]

What would you like?

The cy.visit() command only supports text/html response content-type or documents which can be parsed as HTML. We need the ability to support XHTML documents by allowing response content-type containing application/xhtml+xml.* and avoid the following error message.

cy.visit() failed trying to load:

http://localhost:5000/index.xhtml

The content-type of the response we received from your web server was:

  > application/xhtml+xml

This was considered a failure because responses must have content-type: 'text/html'

Why is this needed?

Our applications run on some devices that use XHTML, which is a stricter extension of HTML based on XML, which browsers can render in the same way as text/html documents.

The content type is allowed in the accept header, but does not seem to be allowed on the response content-type. The current code that checks if the response body looks like html seems to fail to detect it as XHTML documents often begin with XML declarations.

I have had success asserting on-screen elements of XHTML documents with Cypress by disabling the current error messages and will submit a PR allowing the application/xhtml+xml.* response content-type.

[jennifer-shehane]

Related: #1551

[cypress-bot]

The code for this is done in cypress-io/cypress#15741, but has yet to be released.
We'll update this issue and reference the changelog when it's released.

[cypress-bot]

Released in 7.0.0.

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