how to redirect user from handler

[Anatoli Marinov]

Thank you very much  Maxim!

On 09/20/2012 04:17 PM, Maxim Dounin wrote:
> Hello!
>
> On Thu, Sep 20, 2012 at 12:31:12PM +0300, Anatoli Marinov wrote:
>
> [...]
>
>> And this seems to work but 302 answer has a body and it is a chunked
>> response?
> This is because you said it to.
>
>> Is it possible to send it without body.
> No, it's not allowed by a protocol (unless request was HEAD).
> Response body must be present.  It may be empty though.
>
>> I also do not want to be chunked if it is possible.
> It is.  You should set content length, then chunked encoding won't
> be used.  You may take a look at ngx_http_send_response() for a
> complete code (and the function is actually a usefull helper for
> simple cases when you need to return some predefined response).
>
> But actually to return a 302 redirect from a content handler it's
> enough to set Location header and return NGX_HTTP_MOVED_TEMPORARILY,
> i.e. to do something like this:
>
>      ngx_http_clear_location(r);
>
>      r->headers_out.location = ngx_palloc(r->pool, sizeof(ngx_table_elt_t));
>      if (r->headers_out.location == NULL) {
>          return NGX_HTTP_INTERNAL_SERVER_ERROR;
>      }
>
>      /*
>       * we do not need to set the r->headers_out.location->hash and
>       * r->headers_out.location->key fields
>       */
>
>      ngx_str_set(&r->headers_out.location->value, "http://example.com/");
>
>      return NGX_HTTP_MOVED_TEMPORARILY;
>
> (The code was mostly borrowed from static module, with minor
> modification.)
>
> Maxim Dounin
>
>
>>
>>
>> On 09/20/2012 12:12 PM, Anatoli Marinov wrote:
>>> Hello Colleagues,
>>> Which is the right way to redirect user request from handler
>>> module. Now I have something like this in my handler:
>>>
>>> My handler function(r) {
>>>     header = ngx_list_push(&r->headers_out.headers);
>>>     header->key.len = sizeof("Location") - 1;
>>>     header->key.data = (u_char *) "Location";
>>>
>>>     header->value.len = strlen("http://new_location.com/1.dat");
>>>     header->value.data = ngx_pcalloc(r->pool, header->value.len);
>>>
>>>     ngx_snprintf(header->value.data, header->value.len, "%s",
>>> "http://new_location.com/1.dat");
>>>     r->headers_out.status = NGX_HTTP_MOVED_TEMPORARILY;
>>>     r->chunked = 0;
>>>
>>>     ngx_http_send_header(r);
>>>
>>>     return NGX_DECLINED;
>>> }
>>>
>>> I think this approach is wrong. It sends 302 to the client but
>>> there is a body with 404 return code which is not correct.
>>>
>>>
>>> So please advise me how to redirect from hander.
>>>
>>> Thanks in advance
>>> Anatoli Marinov
>>>
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