How to get Original response before gzip or another module filter rewrite response

[Sorin Manole]

Hello,
You need to create a response body filter module. Your filter handler is
called every time some response data is received from the upstream. In that
handler you can use the ngx_write_chain_to_file or
ngx_write_chain_to_temp_file functions to write the data to your file.
An example of such a module is:
https://trac.nginx.org/nginx/browser/nginx/src/http/modules/ngx_http_sub_filter_module.c#L282

http://www.evanmiller.org/nginx-modules-guide.html#filters-body


2015-09-08 18:43 GMT+03:00 hack988 <hack988 at 163.com>:

> Hello,
> I has already read ngx_http_proxy_module.c twice(source code version
> 1.9.4),Sadness that i'm hadn't find ngx_write_chain_to_file or
> ngx_write_chain_to_temp_file function in this source file.
> I found other code:
>
> =================================================================================================
> line 1551
>   for ( ;; ) {
> ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
> "proxy output chunk: %d", ngx_buf_size(cl->buf));
>
> size += ngx_buf_size(cl->buf);
>
> if (cl->buf->flush
> || cl->buf->sync
> || ngx_buf_in_memory(cl->buf)
> || cl->buf->in_file)
> {
> tl = ngx_alloc_chain_link(r->pool);
> if (tl == NULL) {
> return NGX_ERROR;
> }
>
> tl->buf = cl->buf;
> *ll = tl;
> ll = &tl->next;
> }
>
> if (cl->next == NULL) {
> break;
> }
>
> cl = cl->next;
> }
> line 1653
> out:
>
> rc = ngx_chain_writer(&r->upstream->writer, out);
>
> I guss that nginx get response from buffer and rewrite output buffer
> directly.
>
> ===============================================================================================
> line 459
>    { ngx_string("proxy_cache_path"),
> NGX_HTTP_MAIN_CONF|NGX_CONF_2MORE,
> ngx_http_file_cache_set_slot,
> NGX_HTTP_MAIN_CONF_OFFSET,
> offsetof(ngx_http_proxy_main_conf_t, caches),
> &ngx_http_proxy_module },
>
> proxy_cache_path is set to ngx_http_proxy_main_conf_t->caches varible,but
> it doesn't be used in proxy moudle's source code to write cache file.
>
> =================================================================================================
> What I want to do:
> Nginx Call header,body handler like this:
> header handle1->header handler2->body handler1->body hander2
>
> Myself module is in:
> header handle1->header handler2->body handler1->myself body handle->body
> hander2
>
> I want to save response buffer which body handler1 rewrite to a file.
>
>
>
> ------------------------------
> hack988
>
>
> *From:* Hung Nguyen <hungnv at opensource.com.vn>
> *Date:* 2015-09-08 11:01
> *To:* nginx-devel <nginx-devel at nginx.org>
> *Subject:* Re: How to get Original response before gzip or another module
> filter rewrite response
> Hello,
>
> I don’t know which context you are trying to do, but in order to write a
> chain buffer (this’s what contain nginx’s response) to file, you can use
> ngx_write_chain_to_file or ngx_write_chain_to_temp_file function.
> Many nginx modules already use these function, take a look at
> ngx_http_proxy_module for more detail.
>
> —
> Hưng
>
>
> On Sep 7, 2015, at 9:07 PM, hack988 <hack988 at 163.com> wrote:
>
> Hello everybody:
>     Is Anyone can anwer my question? thanks very mach;
>
> ------------------------------
> hack988
>
>
> *From:* hack988 <hack988 at 163.com>
> *Date:* 2015-09-05 21:20
> *To:* nginx-devel <nginx-devel at nginx.org>
> *Subject:* How to get Original response before gzip or another module
> filter rewrite response
>  Dear All:
>     I'm a beginner for nginx development,Although i'm read Emiller's Guide and
> another article about Nginx develop for several days,I still don't know
> how to read whole original response buffer chain copy to myself module's
> temporary buffer,before another module(gzip,gunzip,gzip_static) rewrite
> buffer.
> How to check another module is written output buffer to diffrent content
> type?
> I want to copy buffer to a file that no compress or chunked.
> I'm sorry for my  poor english ,thx.
>
> ------------------------------
> hack988
>
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>
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