Why is replacement not working in nginx rewrite?

Question

Nginx

location / {
  if ($args ~ "_escaped_fragment_=(.*)") {
    rewrite ^ /snapshot/$1/index.html;
    break;
  }

  try_files $uri $uri/ /index.html =404; # html5Mode
}

Gives an error message:

open() "/home/www/site.ru/public/snapshot//index.html" failed (2: No such file or directory),
request: "GET /?_escaped_fragment_=tools HTTP/1.1", host: "site.ru"

It looks like it's trying to open public//snapshot // index.html and inserting $1 doesn't work. Apparently this is due to the fact that the replacement occurs in the location section. How to fix this error?

Answer 1

You expect $1 to be taken from the regex in the if, but it's actually taken from the regex in rewrite, i.e. empty
Use $arg_* variables. For example
rewrite ^ /snapshot/$arg__escaped_fragment_/index.html;