[zod-openapi] c.req.valid in middleware returns undefined

Hi,

I'm trying to create a middleware that will retrieve the headers according to how they were described by the zod schema. So I'm using c.req.valid("header"). However, this method returns undefined in the middleware, where it would return the correct values in the handler.

Here's some reproduction code:

import { createRoute, OpenAPIHono, z } from "@hono/zod-openapi";
import { Env } from "hono";
import { createMiddleware } from "hono/factory";

type MyCustomInput = {
  out: {
    header: {
      authorization: string;
    };
  };
};

const myMiddleware = createMiddleware<Env, string, MyCustomInput>((c, next) => {
  const headers = c.req.valid("header");

  console.log("My headers", headers);

  return next();
});

const myDemoApp = new OpenAPIHono().openapi(
  createRoute({
    method: "get",
    path: "/",
    middleware: [myMiddleware],
    request: {
      headers: z.object({
        authorization: z.string(),
      }),
    },
    responses: {
      200: {
        description: "Success",
        content: {
          "text/plain": {
            schema: z.string(),
          },
        },
      },
    },
  }),
  (c) => {
    const headers = c.req.valid("header");

    console.log("My headers", headers);

    return c.text("Hello, world!");
  },
);

Output:

My headers undefined
My headers { authorization: 'Bearer SECRET' }

honojs / middleware

[zod-openapi] c.req.valid in middleware returns undefined #787