Nginx fastcgi always include the request body with the response

Question

I have a strange problem with a nginx-fpm application ( one docker container with nginx and another one with a php fpm).

When i post (or put, patch) a request the body of the request is added in the response before the response (this issue appear 70 to 90% of my request, it's not always appearing):

the curl:

curl --location --request POST 'http://localhost/foo' \
--header 'Content-Type: application/json' \
--data-raw '{
    "data": "lorem ipsm"
}'

the response:

{
    "data": "lorem ipsm"
}<h1>foo</h1>

---

i have a simple nginx config:

default.conf

location ~ ^/foo\.php(/|$) {
  fastcgi_pass server:9000;
  fastcgi_split_path_info ^(.+\.php)(/.*)$;
  include fastcgi_params;
  fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
  fastcgi_param DOCUMENT_ROOT $realpath_root;
}
location /foo {
 try_files $uri /foo.php;
}

fastcgi param

fastcgi_param  QUERY_STRING       $query_string;
fastcgi_param  REQUEST_METHOD     $request_method;
fastcgi_param  CONTENT_TYPE       $content_type;
fastcgi_param  CONTENT_LENGTH     $content_length;

fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
fastcgi_param  REQUEST_URI        $request_uri;
fastcgi_param  DOCUMENT_URI       $document_uri;
fastcgi_param  DOCUMENT_ROOT      $document_root;
fastcgi_param  SERVER_PROTOCOL    $server_protocol;
fastcgi_param  REQUEST_SCHEME     $scheme;
fastcgi_param  HTTPS              $https if_not_empty;

fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

fastcgi_param  REMOTE_ADDR        $remote_addr;
fastcgi_param  REMOTE_PORT        $remote_port;
fastcgi_param  SERVER_ADDR        $server_addr;
fastcgi_param  SERVER_PORT        $server_port;
fastcgi_param  SERVER_NAME        $server_name;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param  REDIRECT_STATUS    200;

php file

<?php
echo '<h1>foo</h1>';

Nginx version: nginx/1.14.0

Php version: 7.2

Do you have an idea about this issue ?

Answer 1

I was encountering this issue as well using nginx and php-fpm7.4.

I'm not sure what causes the issue, but I resolved the issue by passing: fastcgi_param PHP_VALUE "auto_prepend_file= \n allow_url_include=Off" ; in the location section on the nginx .conf.