add mime information to universal path; include content type in static server

lib/src/http/response/FileResponseFactory.ts

@@ -38,6 +38,7 @@ export default class FileResponseFactory extends ResponseFactory {
         if ( content.headers && content.body && length ) {
             request.response.body = content.body
             request.response.headers.set('Content-Length', length)
+            request.response.headers.set('Content-Type', path.content_type)
         } else {
             this.logger.debug(`Tried to serve file that does not exist: ${path}`)
             request.response.status = HTTPStatus.NOT_FOUND

lib/src/support/UniversalPath.ts

@@ -1,4 +1,5 @@
 import { path as deno_path } from '../external/std.ts'
+import * as Mime from 'https://deno.land/x/media_types/mod.ts'
 
 export enum UniversalPathPrefix {
     HTTP = 'http://',
@@ -87,4 +88,20 @@ export class UniversalPath {
     toString() {
         return `${this.prefix}${this._local}`
     }
+
+    get ext() {
+        return deno_path.extname(this._local)
+    }
+
+    get mime_type() {
+        return Mime.lookup(this.ext)
+    }
+
+    get content_type() {
+        return Mime.contentType(this.ext)
+    }
+
+    get charset() {
+        return Mime.charset(this.mime_type)
+    }
 }