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docs: note which header expressions cannot be used for request headers #8138

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Sep 4, 2019
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docs: note which header expressions cannot be used for request headers #8138

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6 changes: 5 additions & 1 deletion docs/root/configuration/http/http_conn_man/headers.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -602,9 +602,13 @@ Supported variable names are:
namespace and key(s) are specified as a JSON array of strings. Finally, percent symbols in the
parameters **do not** need to be escaped by doubling them.

Upstream metadata cannot be added to request headers as the upstream host has not been selected
when custom request headers are generated.

%UPSTREAM_REMOTE_ADDRESS%
Remote address of the upstream host. If the address is an IP address it includes both address
and port.
and port. The upstream remote address cannot be added to request headers as the upstream host
has not been selected when custom request headers are generated.

%PER_REQUEST_STATE(reverse.dns.data.name)%
Populates the header with values set on the stream info filterState() object. To be
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