coredns/man/coredns-cancel.7

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.TH "COREDNS-CANCEL" 7 "August 2019" "CoreDNS" "CoreDNS Plugins"

.SH "NAME"
.PP
\fIcancel\fP - a plugin that cancels a request's context after 5001 milliseconds.

.SH "DESCRIPTION"
.PP
The \fIcancel\fP plugin creates a canceling context for each request. It adds a timeout that gets
triggered after 5001 milliseconds.

.PP
The 5001 number is chosen because the default timeout for DNS clients is 5 seconds, after that they
give up.

.PP
A plugin interested in the cancellation status should call \fB\fCplugin.Done()\fR on the context. If the
context was canceled due to a timeout the plugin should not write anything back to the client and
return a value indicating CoreDNS should not either; a zero return value should suffice for that.

.PP
.RS

.nf
cancel [TIMEOUT]

.fi
.RE

.IP \(bu 4
\fBTIMEOUT\fP allows setting a custom timeout. The default timeout is 5001 milliseconds (\fB\fC5001 ms\fR)


.SH "EXAMPLES"
.PP
.RS

.nf
\&. {
    cancel
    whoami
}

.fi
.RE

.PP
Or with a custom timeout:

.PP
.RS

.nf
\&. {
    cancel 1s
    whoami
}

.fi
.RE

.SH "ALSO SEE"
.PP
The Go documentation for the context package.