Include details if any in JSON requests

src/common/http.ts

@@ -9,7 +9,7 @@ export enum HttpCode {
 }
 
 export class HttpError extends Error {
-  public constructor(message: string, public readonly code: number) {
+  public constructor(message: string, public readonly code: number, public readonly details?: object) {
     super(message)
     this.name = this.constructor.name
   }

src/node/http.ts

@@ -667,8 +667,10 @@ export class HttpServer {
       if (request.headers["content-type"] === "application/json") {
         write({
           code,
+          mime: "application/json",
           content: {
             error: e.message,
+            ...(e.details || {}),
           },
         })
       } else {