Baoyuantop commented on issue #12442:
URL: https://github.com/apache/apisix/issues/12442#issuecomment-3086564280
This is the expected result. When processing header values, APISIX calls the
`core.utils.resolve_var` function to replace variables. This function uses the
regular expression `(?<!\\)\$(\{(\w+)\}|(\w+))` to match variables in the
format of `$variable` or `${variable}`. When a variable is matched but does not
exist in the context, it is replaced by an empty string.
This is not a bug, but a design feature of APISIX. This feature allows using
Nginx variables in header values (such as `$request_id`, `$remote_addr`, etc.),
but the side effect is that any string containing a `$` sign followed by
alphanumeric characters will be treated as a variable.
I can't think of a good solution. Currently, you can only avoid using the
`$` symbol in the string, or further encode the string. Looking forward to
other people's ideas
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