request help: body_filter how to send request in apisix

[zhangweidongyyl]

Issue description

i want send request in body_filter,based on last request returned Status to send different req

Environment

• apisix version (cmd: apisix version):
• OS (cmd: uname -a):
• OpenResty / Nginx version (cmd: nginx -V or openresty -V):
• etcd version, if have (cmd: run curl http://127.0.0.1:9090/v1/server_info to get the info from server-info API):
• apisix-dashboard version, if have:
• the plugin runner version, if the issue is about a plugin runner (cmd: depended on the kind of runner):
• luarocks version, if the issue is about installation (cmd: luarocks --version):

[tzssangglass]

we can use a 0 delay ngx.timer.at, see: https://github.com/openresty/lua-nginx-module#ngxtimerat

[zhangweidongyyl]

we can use a 0 delay ngx.timer.at, see: https://github.com/openresty/lua-nginx-module#ngxtimerat

This doesn't seem to solve my problem
i use

ngx.header[conf.headers_arr[i]] = val

 in header_filter.
i use

ngx.redirect(host)

in body_filter
I don't know if it can solve this problem, but it can't bring headers 。

[tzssangglass]

I cannot got what you want to do.

BTW, ngx.redirect is unavailable in body_filter_by_lua, see: https://github.com/openresty/lua-nginx-module#ngxredirect

[zhangweidongyyl]

I cannot got what you want to do.

BTW, ngx.redirect is unavailable in body_filter_by_lua, see: https://github.com/openresty/lua-nginx-module#ngxredirect

ngx.req.set_uri it seem can solve my problem

[tzssangglass]

As I've already said, if you want to send the request in the body_filter phase, you can use ngx.timer to do so,see: https://moonbingbing.gitbooks.io/openresty-best-practices/content/ngx_lua/timer.html

[tzssangglass]

based on last request returned Status to send different req

you can last request returned Status get by get_last_failure, see:https://github.com/openresty/lua-resty-core/blob/master/lib/ngx/balancer.md#get_last_failure

[zhangweidongyyl]

As I've already said, if you want to send the request in the body_filter phase, you can use ngx.timer to do so,see: https://moonbingbing.gitbooks.io/openresty-best-practices/content/ngx_lua/timer.html

yes it can slove my problem ,i write like this

`function _M.body_filter(conf, ctx)
local function push_data(premature, uri, args, status)
-- push the data uri, args, and status to the remote
-- via ngx.socket.tcp or ngx.socket.udp
-- (one may want to buffer the data in Lua a bit to
-- save I/O operations)
end
local ok, err = ngx.timer.at(0, push_data,
ngx.var.uri, ngx.var.args, ngx.header.status)
if not ok then
ngx.log(ngx.ERR, "failed to create timer: ", err)
return
end

end`

but my ngx.socket.tcp() always return 400 Bad Request,how can i reslove this problem

[zhangweidongyyl]

i use tcp.socket.connect always return

use https://github.com/openresty/lua-nginx-module#tcpsockconnect example
failed to connect to google: www.google.com could not be resolved (10060: Operation timed out)

[tzssangglass]

but my ngx.socket.tcp() always return 400 Bad Request,how can i reslove this problem

This is a matter of the request method or request parameters. It has to do with your own service.

failed to connect to google: www.google.com could not be resolved (10060: Operation timed out)

This is where your local network environment is unable to resolve the domain name and you can use another domain name that can resolve.

[tzssangglass]

I will turn this issue into a discussion, which has nothing to do with the project.