ngx_http_send_special_response

[hagai avrahami]

Hi
Thanks

The redirect response is from content handler context.

Using the code you added 

cause Nginx to send back the Error Page (302) with Content-Length and Content-Type ("test/html") (And I am trying avoid that) without Body


That's why I assumed using r->header_only = 1  will solve my problem but as you explained it is used for other cases.
please see that in ngx_http_send_special_response when this flag set to 1 the Header is set with this fields but no body in response (I think this is not a good result)

if adding in the beginning of the function (ngx_http_send_special_response) the following code it solves the problem:

  if (r->header_only == 1)
  {
       ngx_http_clear_accept_ranges(r);
       ngx_http_clear_last_modified(r);

        rc = ngx_http_send_header(r);

        return rc;
   }

Is there any other way I can avoid content length and content-type in 302 response
Thanks
Hagai





>________________________________
> From: Maxim Dounin <mdounin at mdounin.ru>
>To: nginx at nginx.org 
>Sent: Monday, April 16, 2012 3:38 PM
>Subject: Re: ngx_http_send_special_response
> 
>Hello!
>
>On Mon, Apr 16, 2012 at 04:29:18AM -0700, hagai avrahami wrote:
>
>> WOW thanks for the quick and elaborate response
>> 
>> So what is the right way to send response with status code 302 on GET request but
>> with content length 0 and no body (I want to redirect the request to other Server)
>
>Easiest solution is to just write
>
>    return 302 $where;
>
>in config. :)
>
>From the code point of view (assuming content handler context), 
>something like this should work:
>
>    ngx_table_elt_t  *h;
>
>    ngx_http_clear_location(r);
>
>    h = ngx_list_push(&r->headers_out.headers);
>    if (h == NULL) {
>        return NGX_HTTP_INTERNAL_SERVER_ERROR;
>    }
>
>    h->hash = 1;
>    ngx_str_set(&h->key, "Location");
>
>    h->value.data = ...
>    h->value.len = ...
>
>    r->headers_out.location = h;
>
>    return NGX_HTTP_MOVED_TEMPORARILY;
>
>Maxim Dounin
>
>
>> 
>> Thanks 
>> 
>> Hagai
>> 
>> 
>> 
>> 
>> >________________________________
>> > From: Maxim Dounin <mdounin at mdounin.ru>
>> >To: nginx at nginx.org 
>> >Sent: Monday, April 16, 2012 12:37 PM
>> >Subject: Re: ngx_http_send_special_response
>> > 
>> >Hello!
>> >
>> >On Mon, Apr 16, 2012 at 01:53:39AM -0700, hagai avrahami wrote:
>> >
>> >> 
>> >> 
>> >> Hi
>> >> 
>> >> I am appreciate any help I can get on the following issues.
>> >> 
>> >> I am writing my own module.
>> >> 
>> >> 1. I can see in function ngx_http_send_special_response
>> >>     that it calculates the content length of the error page even if the request signed as header only (r->header_only = 1)
>> >>     and set the content length header with value, after sending the header it does not send the body ( because  r->header_only = 1)
>> >>     so the response arrive with content length different than 0 but without body 
>> >> 
>> >>     Is it a BUG?
>> >
>> >No.  The r->header_only flag should is set when body isn't 
>> >expected per protocol (HEAD requests, 304 responses).  Having 
>> >Content-Length present in such responses is ok.
>> >
>> >> 2.In the module I am trying to redirect the request with status code 302 (NGX_HTTP_MOVED_TEMPORARILY)
>> >>    Trying to user->headers_out.location for the Alternate URL failed, I looked in the code and saw the Location must start with "/" - why?
>> >
>> >You have to set it correctly, i.e. add to r->headers_out.headers 
>> >and link to r->headers_out.location.  If it starts with "/" it 
>> >works even if set incorrectly due to adding of a server_name, 
>> >that's probably what confused you.
>> >
>> >>    In the end I add it to r->headers_out.headers
>> >>    using header = ngx_list_push(&r->headers_out.headers);
>> >>    Is it the write way to do it?
>> >> 
>> >> 3. Can you explain please the different between
>> >>     a. r->headers_out.content_length_n
>> >>     b. r->headers_out.content_length
>> >
>> >The content_length_n is a numeric length, this what you normaly 
>> >should set when generating response in nginx.  The content_length 
>> >is a pointer to a headers array element, it might be present if 
>> >there is string representation of a Content-Length header 
>> >available for some reason (e.g. from a backend).
>> >
>> >> 4. Can you explain the usage of the hash field in ngx_table_elt_t
>> >
>> >Normally the hash field is used for fast lookups in hash 
>> >structures.  In case of r->headers_out it's usually just set to 1 
>> >indicate the header is valid (or reset to 0 to indicate the 
>> >header should not be sent as it was superseeded by some other 
>> >header).
>> >
>> >Maxim Dounin
>> >
>> >_______________________________________________
>> >nginx mailing list
>> >nginx at nginx.org
>> >http://mailman.nginx.org/mailman/listinfo/nginx
>> >
>> >
>
>> _______________________________________________
>> nginx mailing list
>> nginx at nginx.org
>> http://mailman.nginx.org/mailman/listinfo/nginx
>
>_______________________________________________
>nginx mailing list
>nginx at nginx.org
>http://mailman.nginx.org/mailman/listinfo/nginx
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.nginx.org/pipermail/nginx/attachments/20120416/f7e06dd5/attachment.html>