redirect after body capture

Dk Jack dnj0496 at
Thu May 16 00:35:54 UTC 2019

In my module, I am trying to forward the request to my server based on the
content of the request body. To acheive this, I've added a body capture
filter to capture the body. Here are the relevant parts of my code...

static ngx_int_t
nginx_inspect_body_filter(ngx_http_request_t *r, ngx_chain_t *in)

    ... // extract body
    if (if_content_of_interest_in_body(body, body_length)) {
        ngx_str_t uri = ngx_string("/my_location");
        ngx_http_internal_redirect(r, &url, NULL);
        ngx_http_finalize_request(r, NGX_DONE);
        // return NGX_DONE;   // causes connection abort.
    return ngx_http_next_body_filter(r, in);

I have the following conf for '/my_location':

  server {
     location / {
     location /my_location {
         proxy_pass http://myserver;

However, I am running into an issue with my code. If return NGX_DONE after
internal redirect, I get a connection abort. If I call, next_body_filter,
the connection seems to hang.

Doing a redirect, using similar code in PREACCESS_PHASE works without any
issues. The issue seems to happen only when I wait to read the entire body
and perform the redirect based on the content of the body. With no body
capture, it works fine.

Do I need to do anything additional to redirect in the body filter? Thanks
for your help.

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