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The "Header;" syntax for empty headers does not disable automatically generated headers #2357

mkauf opened this issue Mar 4, 2018 · 1 comment


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mkauf commented Mar 4, 2018

I did this

I want to disable an automatically generated header (e.g. "Host") and send an empty header instead:
/curl -v -H 'Host;' ''

I expected the following

I expected that curl sends a "Host" header with an empty value. Instead, it sends two "Host" headers, the default one ("Host:") and the custom one ("Host:").

As a workaround, it's possible to send just the custom one with this command:
curl -v -H 'Host:' -H 'Host;' ''

curl/libcurl version

curl 7.59.0-DEV

operating system


@bagder bagder added the HTTP label Mar 4, 2018
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bagder commented Mar 4, 2018

Good find! This is clearly a mistake and we should fix it and add a test case or two for it...

@bagder bagder self-assigned this Mar 5, 2018
bagder added a commit that referenced this issue Mar 5, 2018
@bagder bagder closed this as completed in 8123560 Mar 11, 2018
@lock lock bot locked as resolved and limited conversation to collaborators Jun 9, 2018
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