several fixes on command exports has several problems: #3676

* authority can usually rely on actual URL. as `:authority` headers will
break curl command. (advise if it's better to change them to Host, or if
it should be reported on curl side)
* `content-length`: 0 is added for each request. if it's found in the
curl argument list, it'll try to fetch an empty body (and crash).
also trying to guess on accept-encoding header to add the
`--compress` option when fetching potentially compressed content.
* ditto for httpie
* factorize it into raise_if_missing_request (and rename it)

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