Why doesn't the webserver pick up a %20 space in a link?

Question

symfony

Old nginxa config:

map $request_uri $expires {
  default off;
  ~*\.(css|js|gif|jpe?g|png|woff|svg)$ 168h;
}

map $request_uri $cacheControl {
  default no-cache;
  ~*\.(css|js|gif|jpe?g|png|woff|svg)(\?v=\d+)?$ "public";
}

server {
  listen 80;
  server_name mysite.com;
    rewrite ^(.*) https://www.mysite.com$1 permanent;
}

server {
  listen 80;
  server_name blog.mysite.com;
  rewrite ^(.*) https://www.mysite.com permanent;
}

server {
  listen 80;
  server_name media.mysite.com;
  rewrite ^(.*) https://www.mysite.com permanent;
}

include /etc/nginx/conf.d/nginx-redirects-map.txt;

server {
  listen 80;
  root /var/www/mysite/mysite/public;
  server_name www.mysite.com node1.mysite.com;
  proxy_set_header X-Forwarded-Proto $scheme;

  real_ip_header X-Forwarded-For;
  real_ip_recursive on;

  index index.html;

  location /search/ {
    rewrite ^/search/([^\?].*)$ https://www.mysite.com/search?search_phrase=$1 last;
  }

  location /deprecated.html {
    index deprecated.html last;
  }

  location / {
    if ($deprecated = 1) {
      rewrite ^ https://www.mysite.com/deprecated.html redirect;
    }

    if ($http_x_forwarded_proto = "http") {
      rewrite ^/(.*)$ https://www.mysite.com/$1 permanent;
    }
        
    if ($new_uri) {
      rewrite ^ $new_uri permanent;
    }

    rewrite ^/(.*)/$ https://www.mysite.com/$1 permanent;

    add_header Cache-Control $cacheControl;

    include /etc/nginx/mime.types;
    try_files $uri @prerender;
  }

  location /api {
        root /var/www/mysite/mysite-api/web;
        rewrite ^/api/(.*)$ /$1 break;
        try_files $uri /app.php$is_args$args;
    }

    # PROD
    location ~ ^/app\.php(/|$) {
        set $request_url $request_uri;
        if ($request_uri ~ ^/api/(.*)$ ) {
            set $request_url /$1;
        }

        fastcgi_buffers 16 16k;
        fastcgi_buffer_size 32k;
        fastcgi_read_timeout 600;

        fastcgi_pass 127.0.0.1:9000;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param REQUEST_URI $request_url;
        fastcgi_param SCRIPT_FILENAME /var/www/mysite/mysite-api/web$fastcgi_script_name;
        fastcgi_param DOCUMENT_ROOT /var/www/mysite/mysite-api/web;
        internal;
    }

  location /api/panel {
    	root /var/www/mysite/mysite-api/web;
    try_files $uri /api/app.php$is_args$args;
  }

  error_log /var/log/nginx/mysite_mysite_error.log;
  access_log /var/log/nginx/mysite_mysite_access.log;
}

If you make a selection through the api /api/search/locations/Hong, then this selection works. If you make a slightly different selection /api/search/locations/Hong%20Kong - then the answer is empty. Although if you manually execute the same request to the database, then there are records.
Added:

echo '<pre>';
var_dump($_SERVER);
die();

Now confuses% 2520 such a feeling that it decodes 2 times.

["REQUEST_URI"]=>
  string(41) "/search/locations/Hong%2520Kong%3Flimit=5"

Tell me, what could be the snag?

Answer 1

set $request_url $request_uri;
        if ($request_uri ~ ^/api/(.*)$ ) {
            set $request_url /$1;
        }

Instead of this construct, apply map.

map $request_uri $request_url {
    default      $request_uri;
    ~^/api(/.*)  $1;
}