fpm-php + nginx + POST data

When sending a POST request, fpm-php chaotically returns either a normally processed PHP script <?=die("111");?> will return either “111” or a response of 200 and the body of the POST request itself, in this form: “rnd=1173943626&sessid=b2e74736d05a7d16efbfa99a603c66ad”.

Nginx.conf without any specific things, PHP processing is performed in this form:

location ~ .php$ {
   try_files       $uri @bitrix;
   fastcgi_pass     fpm-php:9000;
   fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
   include fastcgi_params;
   fastcgi_param REMOTE_ADDR $remote_addr;
   fastcgi_read_timeout 99999;
}