Firstsawyou commented on issue #4138:
URL: https://github.com/apache/apisix/issues/4138#issuecomment-827406877
> core.log.warn("headers_map: ", headers_map)
Because the headers_map type is a table, not a string. Therefore, it cannot
be printed out directly, it needs to be encoded first. You should debug like
this:
```
core.log.warn("headers_map: ", core.json.encode(headers_map))
```
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