Provide the proper content-type in wasm sample

samples/html5Canvas/src/httpServerMain/kotlin/HttpServer.kt

@@ -7,9 +7,14 @@
 
 package sample.html5canvas.httpserver
 
+import io.ktor.application.call
+import io.ktor.http.ContentType
+import io.ktor.http.content.LocalFileContent
 import io.ktor.http.content.default
 import io.ktor.http.content.files
 import io.ktor.http.content.static
+import io.ktor.response.respond
+import io.ktor.routing.get
 import io.ktor.routing.routing
 import io.ktor.server.engine.embeddedServer
 import io.ktor.server.netty.Netty
@@ -34,6 +39,16 @@ fun main(args: Array<String>) {
 
     val server = embeddedServer(Netty, 8080) {
         routing {
+            val wasm = "build/bin/html5Canvas/releaseExecutable/html5Canvas.wasm"
+            get(wasm) {
+                // TODO: ktor as of now doesn't know about 'application/wasm'.
+                // The newer browsers (firefox and chrome at least) don't allow
+                // 'application/octet-stream' for wasm anymore.
+                // We provide the proper content type here and,
+                // at the same time, put it into the ktor database.
+                // Remove this whole get() clause when ktor fix is available.
+                call.respond(LocalFileContent(File(wasm), ContentType("application", "wasm")))
+            }
             static("/") {
                 files(contentRoot)
                 default("index.html")