Dynamic file type support

[5ouma]

✏️ Describe the feature

Currently, it responds to the request with contents as text/plain so they must be code files. However, some people might specify non-text files such as images or videos, so it should detect the file type and change the response MIME type.

✔︎ Confirm these checks

• I searched the GitHub Issues or Discussions.
• I tried with the latest version.
• I agree to follow the Code of Conduct.

🗒️ Additional Information

reproxy/src/router.ts

Lines 4 to 14 in 1bb2d1f

	export const router = new Router();
	router
	.get("/", async <R extends string>(ctx: RouterContext<R>) => {
	ctx.response.type = "text/plain";
	if (!redirect(ctx, ctx.request.userAgent)) await getContent(ctx);
	})
	.get("/:ref", async <R extends string>(ctx: RouterContext<R>) => {
	const ref: string | undefined = ctx.params.ref;
	ctx.response.type = "text/plain";
	if (!redirect(ctx, ctx.request.userAgent, ref)) await getContent(ctx, ref);
	});

[5ouma]

@std/media-types might be the good choice.