How can I extract the scheme, host and port to use another route in a response? #2389

FritsHoogland · 2023-12-01T11:00:39Z

FritsHoogland
Dec 1, 2023

Summary

I have a route that generates html that gets sent to the client, which contains a picture on the same server in another route:

The function the route is bound to is below, together with what I have been trying so far.
Currently, I have set scheme, host and port set to fixed values. However, I want it to pick up these from the client request, so that any client GET request that makes it to this route will be able to pick up the image:

async fn plot_handler_html(OriginalUri(url): OriginalUri) -> axum::response::Html<String> {
 let scheme = url.scheme_str().unwrap_or("unknown");
 let host = url.host().unwrap_or("unknown");
 let port = if let Some(port) = url.port() { format!(":{}", port) } else { String::from(":unknown") };
 let server_spec = format!("{}://{}{}", scheme, host, port);
 format!(r#"
 format!(r#"
 <!doctype html>
 <html>
  <body>
   <img src="{server_spec}/img">
  </body>
 </html>
 "#).into()
}

The problem here is that the response is:

➜ curl http://localhost:3000

 <!doctype html>
 <html>
  <body>
   <img src="unknown://unknown:unknown/img">
  </body>
 </html>

For which I would expect, and hope to accomplish with your help to be http://localhost:3000/img as image source.

axum version

0.7.1

anarchodin · 2023-12-24T16:32:37Z

anarchodin
Dec 24, 2023

The request doesn't contain that information. In theory, the Host header is required now, but that doesn't include the scheme, so even that isn't quite enough.

I assume you actually need this for something other than the given example, because that is trivially the same as using <img src="/img">. (Unless you're using <base> with a different origin, in which case my sympathy is extremely limited.)

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How can I extract the scheme, host and port to use another route in a response? #2389

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How can I extract the scheme, host and port to use another route in a response? #2389

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FritsHoogland Dec 1, 2023

Summary

axum version

Replies: 1 comment

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anarchodin Dec 24, 2023

FritsHoogland
Dec 1, 2023

anarchodin
Dec 24, 2023