fix(content): handle readable ended request

[nozomuikuta]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Resolves: #292

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

I added a test to check default options.
If there is a way to check page transition with server middleware, please let me known so that I can add such test.
I removed reqBodyKey according to a review comment that req.body is a standard in Node.js community.

By the way, test was failed due to highlighter snapshot tests.
A color code was not matched in HTML.
I guess CI will fail too.

[atinux]

Thanks for the fix @nozomuikuta

I think we don't need reqBodyKey since req.body is a standard in Node :)

[pi0]

Thanks!

Note for future: We shall use h3.useBody utility later on (and body is express specific)