Expose the Accept header

[Marwes]

trafficstars

Enables Accept without any deeper changes and exposes the internal Method of AccessControlRequestMethod. Probably a better way of doing this PR but this adds the features I need to migrate from https://github.com/dekellum/hyperx

[seanmonstar]

Thanks for the PR!

The AccessControlRequestMethod change is easier to merge, can you make that a separate PR? When doing so, instead of exposing the field, I'd suggest making a method, or even impl From<AccessControlRequestMethod> for Method.

[nerdrew]

Is there anything blocking this PR from getting merged?

[tlovell-sxt]

bumping interest in this PR, or at least interest in having the accept header available