spacewander commented on issue #5451:
URL: https://github.com/apache/apisix/issues/5451#issuecomment-1064724614
Well, personally I prefer to use an array of filters:
```
"filters": [{
"expr": ... # if given, run the filter when it's evaluated to true. Can be
used to support "content-type" and more.
"kind": "regex", # a string enum would be better
"scope": ...,
"pattern": ...,
...
}]
```
> equals to 1 then fallback to completely substitute, otherwise goto regex
substitute(both in header_filter and body_filter).
"completely substitute" can be named as sub_filter substitute? As Nginx's
sub_fitler supports variable, which isn't a plain substitute.
> local body = ngx.arg[1]
> ngx.arg[1] = sub(conf.filter_pattern, conf.filter_replace,
conf.filter_options)
I am afraid we can't do regex in the stream. This requires the regex engine
to have stream mode, for example, see https://github.com/google/re2/issues/127.
In fact, Nginx's sub_filter will buffer the data before substitution.
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