Using location.capture to post a form

Server NGINX
1

Hi All,
I am calling an webapplication from nginx. I want to capture the
response
and post the response body as a post parameter to another application.
I am doing something like this

local maken_res = ngx.location.capture(“/test”, { method =
ngx.HTTP_POST
,body = “name = John”})

The post goes through but receiving application does not get request
parameter.

Any suggestion would really be appreciated.

-Jyoti

Posted at Nginx Forum:

2

Hello!

On Tue, Sep 16, 2014 at 11:24 AM, jpsonweb wrote:

I am calling an webapplication from nginx. I want to capture the response
and post the response body as a post parameter to another application.
I am doing something like this
local maken_res = ngx.location.capture("/test", { method = ngx.HTTP_POST
,body = “name = John”})
The post goes through but receiving application does not get request
parameter.

I think you also need to pass the request header “Content-Type:
application/x-www-form-urlencoded” to your subrequest because your
“receiving application” might require that.

Regards,
-agentzh

3

Thank you Yichun,

I was able to post the parameter from nginx by passing the arguments
using
this.
local maken_res = ngx.location.capture(“/test”, { method =
ngx.HTTP_POST,
args = { pagelayout = dev_res_encoded }});

This works only when post parameter size is less than 81568 characters.
When
the parameter size is greater than 81568, we get error 502.

is there any way to get around this limitation or is there a different
way
to post more than 81568 characters.

Jyoti

Posted at Nginx Forum:

4

Hello!

On Thu, Sep 18, 2014 at 9:02 AM, jpsonweb wrote:

I was able to post the parameter from nginx by passing the arguments using
this.
local maken_res = ngx.location.capture(“/test”, { method = ngx.HTTP_POST,
args = { pagelayout = dev_res_encoded }});

You’re passing your args via URI arguments rather than POST body. See

"* args
specify the subrequest’s URI query arguments (both string value and
Lua tables are accepted)
"

This works only when post parameter size is less than 81568 characters. When
the parameter size is greater than 81568, we get error 502.

Apparently you’re hitting the URL length limit on your backend server.

BTW, it’s better to post such questions to the openresty-en mailing
list instead: https://groups.google.com/group/openresty-en

Regards,
-agentzh