5.3. Lab 2 - Decode URI

1. Start an NGINX docker instance with the decode_uri app by running the following commands: This places the decode_uri.conf file and decode_uri.js files into the running NGINX instance.

   EXAMPLE=decode_uri
   docker run --rm --name njs_example  -v $(pwd)/conf/$EXAMPLE.conf:/etc/nginx/nginx.conf:ro  -v $(pwd)/njs/$EXAMPLE.js:/etc/nginx/example.js:ro -p 80:80 -p 8090:8090 -d nginx
   

   The nginx.conf will be as follows, notice it sends the /uri 'dec_foo' to a njs function:

    ...
   
    http {
      js_include example.js;
   
      js_set $dec_foo dec_foo;
   
      server {
   ...
   
         location /foo {
             return 200 $arg_foo;
         }
   
         location /dec_foo {
             return 200 $dec_foo;
         }
       }
   }
   

   The njs decode_uri.js file is as follows. Notice it takes the arguments sent to it and decodes it to readable format:

   function dec_foo(r) {
     return decodeURIComponent(r.args.foo);
   }
   

2. To see it work run the following commands from the linux shell:

   curl -G http://localhost/foo --data-urlencode "foo=Hello World"
   Hello%20World
   
   curl -G http://localhost/dec_foo --data-urlencode "foo=Hello World"
   Hello World
   
   docker stop njs_example