Determine behaviour for HTTP1.0 request w/o Host header

[usualoma]

The following results are currently returned

app

const app = new Hono()
app.get('/', (c) => c.text(c.req.raw.url))

const port = 3002
serve({
    fetch: app.fetch,
    port,
})

request

$ curl http://127.0.0.1:3002 -H 'Host:' --http1.0
http://undefined/

HTTP1.0 request w/o Host header is not an illegal request and should not be an error, but http://undefined/ is an incorrect URL.

Nevertheless, even reverse proxies that speak HTTP1.0 would normally add a Host header, so it may be acceptable to say "Request without Host header is an error”.

If the aim is to support all cases, it may be possible to specify the default hostname as an option, but this seems a bit excessive.

diff --git a/src/listener.ts b/src/listener.ts
index 82655d2..17855b3 100644
--- a/src/listener.ts
+++ b/src/listener.ts
@@ -142,6 +142,7 @@ export const getRequestListener = (
   options: {
     errorHandler?: CustomErrorHandler
     overrideGlobalObjects?: boolean
+    defaultHostnames?: string
   } = {}
 ) => {
   if (options.overrideGlobalObjects !== false && global.Request !== LightweightRequest) {