lua subrequest to fcgi server not getting response content with request type POST

91prashantgaur · 2014-05-27T18:31:15+00:00

Hello! On Mon, May 26, 2014 at 4:38 PM, Vladislav Manchev wrote: > This does not work though even if I pass the websocket object as a parameter > to t...

lua subrequest to fcgi server not getting response content with request type POST

91prashantgaur

I am using Openresty web server and i am making subrequest from lua to hit fcgi .
when i am making a subrequest with GET request i am able to recieve response content from fcgi .


        ngx.log(ngx.DEBUG, key .."\tVisitor found moking subrequest to django for response.")
        res = ngx.location.capture(ngx.var.request_uri, {share_all_vars=true, copy_all_vars=true, always_forward_body = true})

        ngx.header.content_type = res.header.content_type
        ngx.print(res.body)   -- body content is coming fine

But when i am making POST request from lua to fcgi. i am not able to get response content from fcgi .value of res.body is nil.

    if ngx.req.get_method() == "POST" then
        -- check if request method is POST
        ngx.log(ngx.DEBUG, "Request method is POST so moving to django")
        res = ngx.location.capture(ngx.var.request_uri, {method = ngx.HTTP_POST, share_all_vars=true, copy_all_vars=true, always_forward_body = true})
        ngx.header.content_type = res.header.content_type
        ngx.print(res.body)   -- res.body is nil
         ngx.exit(ngx.HTTP_OK)

agentzh

Hello!

On Tue, May 27, 2014 at 3:31 AM, Prashant Gaur wrote:
> But when i am making POST request from lua to fcgi. i am not able to get
> response content from fcgi .value of res.body  is nil.
>
>     if ngx.req.get_method() == "POST" then
>         -- check if request method is POST
>         ngx.log(ngx.DEBUG, "Request method is POST so moving to django")
>         res = ngx.location.capture(ngx.var.request_uri, {method =
> ngx.HTTP_POST, share_all_vars=true, copy_all_vars=true, always_forward_body
> = true})
>         ngx.header.content_type  = res.header.content_type
>         ngx.print(res.body)   -- res.body is nil
>          ngx.exit(ngx.HTTP_OK)
>

Several common mistakes:

1. you did not read the request body before initiating the subrequest via

    ngx.req.read_body()

2. your backend may require the "Content-Type:
application/x-www-form-urlencoded" request header but you failed to
provide one.

Some more suggestions:

1. check the res.status value after the ngx.location.capture() call.
2. check your backend fastcgi server's error logs.
3. check the packets transferred between your nginx and your fastcgi
backend with tools like wireshark and tcpdump. Or maybe your fastcgi
backend just reset the connection. Not sure.
4. check your nginx error log file to see if there is any hint. Ensure
you do not use a very high error log filtering level in your
"error_log" directive (the "debug" level should be good for
diagnostics).
5. enable the nginx debugging logs to see if there is anything
unexpected: http://nginx.org/en/docs/debugging_log.html

Without further details for your problem on your side, I cannot
provide more specific help here.

Regards,
-agentzh

91prashantgaur

Thanks

On Tuesday, 27 May 2014 16:01:14 UTC+5:30, Prashant Gaur wrote:

I am using Openresty web server and i am making subrequest from lua to hit fcgi .
when i am making a subrequest with GET request i am able to recieve response content from fcgi .


        ngx.log(ngx.DEBUG, key .."\tVisitor found moking subrequest to django for response.")
        res = ngx.location.capture(ngx.var.request_uri, {share_all_vars=true, copy_all_vars=true, always_forward_body = true})

        ngx.header.content_type = res.header.content_type
        ngx.print(res.body)   -- body content is coming fine

But when i am making POST request from lua to fcgi. i am not able to get response content from fcgi .value of res.body is nil.

    if ngx.req.get_method() == "POST" then
        -- check if request method is POST
        ngx.log(ngx.DEBUG, "Request method is POST so moving to django")
        res = ngx.location.capture(ngx.var.request_uri, {method = ngx.HTTP_POST, share_all_vars=true, copy_all_vars=true, always_forward_body = true})
        ngx.header.content_type = res.header.content_type
        ngx.print(res.body)   -- res.body is nil
         ngx.exit(ngx.HTTP_OK)