Possibility to read multiple headers etc, from the same file

[svenXY]

Checklist

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Enhancement request

curl can - with the -H parameter - read many headers from the same file whereas httpie seems to only support one header (value) per file. In addition, the file in httpie can only contain the header value, not the key:value pair which can make it quite confusing if after a while you have many small files with values.

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Problem it solves

Not having to provide many files and not having to know, to which header the value belongs