Error response enhancements, CoreID auth client backend

src/http/lifecycle/Response.ts

@@ -195,6 +195,10 @@ export class Response {
      */
     public async write(data: string | Buffer | Uint8Array | Readable): Promise<void> {
         return new Promise<void>((res, rej) => {
+            if ( this.responseEnded ) {
+                throw new ErrorWithContext('Tried to write to Response after lifecycle ended.')
+            }
+
             if ( !this.sentHeaders ) {
                 this.sendHeaders()
             }