Provide custom header callback in addition to progress #102
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This feature seems necessary for implementing rust-lang/rustup#344, as
curl_easy_perform
is blocking.I particularly don't like the name for the new builder method
header_cb
because it clashes withheaders
, but I couldn't immediately come up with a better name. Any suggestions on this?BTW I'm relatively new to Rust (haven't used it for almost 1 year), so please kindly point out any mistake I might have made. Thanks!