illidan33 commented on issue #10915:
URL: https://github.com/apache/apisix/issues/10915#issuecomment-1929846363
> > You can change the status of response in the `header_filter` phase. like
this: `ngx.header.content_length = #your body's length`
`ngx.header.content_encoding = nil ` `ngx.status = 400` `header_filter` must
work with `body_filter` when you want to modify both header and body. It worked
for me.
>
> I can change the response status only in the `header_filter` phase, but I
want to change the status only when the response body is invalid. The following
situation arises: In the `header_filter` phase, we can change the status of the
response, but we cannot read and validate the response body and set the status
based on the validation. In the `body_filter` phase, we can read and validate
the response body, but we cannot change the response status.
```
function _M.access(conf, ctx)
local body = ngx.req.get_body_data()
core.log.info("example2 access phase, get_body_data: ", body)
if string.find(body, "test") then
core.log.info("example2 access phase, set filter_flag true")
ctx.filter_flag = true
else
ctx.filter_flag = false
end
end
function _M.header_filter(conf, ctx)
core.log.info("example2 header_filter phase, ctx filter_flag: ",
ctx.filter_flag)
if ctx.filter_flag then
ngx.status = 401
end
end
```
Part of the log after I run it is here:
> 2024/02/06 14:08:06 [info] 75#75: *610 [lua] example-plugin2.lua:63:
phase_func(): example2 access phase, get_body_data: {"test":"test"}
> 2024/02/06 14:08:06 [info] 75#75: *610 [lua] example-plugin2.lua:65:
phase_func(): example2 access phase, set filter_flag true
> 2024/02/06 14:08:06 [info] 75#75: *610 [lua] example-plugin2.lua:73:
phase_func(): example2 header_filter phase, ctx filter_flag: true while reading
response header from upstream
curl log:
> curl -sL -w "http_code:%{http_code} content_type:%{content_type}" -o
/dev/null --request POST 'http://xxxxxxx' -d '{"test":"test"}'
> http_code:401 content_type:application/json; charset=utf-8%
In the access phase, the body is read and the flag is set. In the
header_filter phase, the response status can be set according to the flag.
Is that ok for you?
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