What is the best way to get the full url that Deno.serve() is running on?

If I have:

Deno.serve(
    { port: 1993, hostname: '0.0.0.0' }, 
    (_req) => new Response("Hello, world")
);

Deno.serve(
    { port: 1993, hostname: '0.0.0.0' }, 
    (_req) => new Response("Hello, world")
);

I know the url will be: http://0.0.0.0:1993 . Is there something in the Deno.* API that I can reference to get it though?

4 Replies

gabe•3w ago

yes, the handler (second parameter to Deno.serve() ) is a function that receives 2 parameters: requestand info: - serve docs: https://docs.deno.com/api/deno/~/Deno.serve#function_serve_2 - ServeHandler type definition: https://docs.deno.com/api/deno/~/Deno.ServeHandler try this:

Deno.serve(
    { port: 1993, hostname: '0.0.0.0' }, 
    (_req, info) => { 
      console.log(info);
      return new Response("Hello, world");
    }
);

Deno.serve(
    { port: 1993, hostname: '0.0.0.0' }, 
    (_req, info) => { 
      console.log(info);
      return new Response("Hello, world");
    }
);

Fifth-Normal-Form•3w ago

You can also get it from the request:

Deno.serve({ port: 1993, hostname: '0.0.0.0'},
    (request: Request) => {
        const url = new URL(request.url)
        return new Response(`
            Hello From:
            origin = ${url.origin}
            host = ${url.host}
            hostname = ${url.hostname}
            port = ${url.port}
            transport protocol = ${url.protocol}:
        `)
    })

Deno.serve({ port: 1993, hostname: '0.0.0.0'},
    (request: Request) => {
        const url = new URL(request.url)
        return new Response(`
            Hello From:
            origin = ${url.origin}
            host = ${url.host}
            hostname = ${url.hostname}
            port = ${url.port}
            transport protocol = ${url.protocol}:
        `)
    })

I'm on Widows where 0.0.0.0 === localhost.

Hello From:
  origin = http://localhost:1993
  host = localhost:1993
  hostname = localhost
  port = 1993
  transport protocol = http:

Hello From:
  origin = http://localhost:1993
  host = localhost:1993
  hostname = localhost
  port = 1993
  transport protocol = http:

If I then open 127.0.0.2 :1993 as expected:

Hello From:
  origin = http://127.0.0.2:1993
  host = 127.0.0.2:1993
  hostname = 127.0.0.2
  port = 1993
  transport protocol = http:

Hello From:
  origin = http://127.0.0.2:1993
  host = 127.0.0.2:1993
  hostname = 127.0.0.2
  port = 1993
  transport protocol = http:

Logging info on Windows returns an empty object?

ServeHandlerInfo {}

ServeHandlerInfo {}

With either console.log(info) or, console.info(info)?

Jasmine Boba'teaOP•3w ago

Thanks all! This is extremely helpful 🙂

YousefShanawany•3w ago

I honestly just store these as environment variables since they differ per environment.

What is the best way to get the full url that Deno.serve() is running on?

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