Force GET for head requests.

[reitermarkus]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
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• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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Fixes #5895.

[MikeMcQuaid]

Nice. Didn't know you could do this, TIL!

[reitermarkus]

I didn't either, just made a wild guess. 😃

[MikeMcQuaid]

@reitermarkus In case you didn't see #5977 was also merged but I think both changes, although not necessary, make more sense in avoiding stuff like this in future.

[reitermarkus]

Yeah, you beat me by a minute. Two fixes are better than one. 😉

[MikeMcQuaid]

For full disclosure: I also did a quick check of the codebase to see if we're using --head or -I inappropriately anywhere else and couldn't see anywhere 👍

[MikeMcQuaid]

Thanks @reitermarkus ❤️