From bccdb8986535fbcc9722b204a3dbf1cbc2bd98c7 Mon Sep 17 00:00:00 2001
From: Jonathan Taylor <jonny.taylor5@gmail.com>
Date: Sun, 5 Sep 2021 22:18:16 +0100
Subject: [PATCH 1/2] fix headers no longer readonly

---
 types/request.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/types/request.d.ts b/types/request.d.ts
index 5915c1aaef..2857fba3b5 100644
--- a/types/request.d.ts
+++ b/types/request.d.ts
@@ -23,6 +23,7 @@ export interface FastifyRequest<
   params: RouteGeneric['Params'];
   raw: RawRequest;
   query: RouteGeneric['Querystring'];
+  headers: RawRequest['headers'] & RouteGeneric['Headers']; // this enables the developer to extend the existing http(s|2) headers list
   log: FastifyLoggerInstance;
   server: FastifyInstance;
   body: RouteGeneric['Body'];
@@ -34,7 +35,6 @@ export interface FastifyRequest<
    * @deprecated Use `raw` property
    */
   readonly req: RawRequest;
-  readonly headers: RawRequest['headers'] & RouteGeneric['Headers']; // this enables the developer to extend the existing http(s|2) headers list
   readonly ip: string;
   readonly ips?: string[];
   readonly hostname: string;

From 2d49a47783683a5bfdd6e299896f96ebde0d4034 Mon Sep 17 00:00:00 2001
From: Jonathan Taylor <jonny.taylor5@gmail.com>
Date: Mon, 6 Sep 2021 10:31:58 +0100
Subject: [PATCH 2/2] test that headers can be set

---
 test/types/request.test-d.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/types/request.test-d.ts b/test/types/request.test-d.ts
index 56d0a1a083..aa50150c1e 100644
--- a/test/types/request.test-d.ts
+++ b/test/types/request.test-d.ts
@@ -1,6 +1,6 @@
 import { expectType } from 'tsd'
 import fastify, { RouteHandler, RawRequestDefaultExpression, RequestBodyDefault, RequestGenericInterface } from '../../fastify'
-import { RawServerDefault, RequestParamsDefault, RequestHeadersDefault, RequestQuerystringDefault, RawReplyDefaultExpression } from '../../types/utils'
+import { RequestParamsDefault, RequestHeadersDefault, RequestQuerystringDefault } from '../../types/utils'
 import { FastifyLoggerInstance } from '../../types/logger'
 import { FastifyRequest } from '../../types/request'
 import { FastifyReply } from '../../types/reply'
@@ -50,7 +50,10 @@ const getHandler: RouteHandler = function (request, _reply) {
   expectType<RawRequestDefaultExpression>(request.raw)
   expectType<RequestBodyDefault>(request.body)
   expectType<RequestParamsDefault>(request.params)
+
   expectType<RequestHeadersDefault & RawRequestDefaultExpression['headers']>(request.headers)
+  request.headers = {}
+
   expectType<RequestQuerystringDefault>(request.query)
   expectType<any>(request.id)
   expectType<FastifyLoggerInstance>(request.log)