pupo•5mo ago

Missing content type header for mutations leads to 405

Im migrating my app from Next Pages Router to App Router. I implemented the new trpc wrapper as explained here and everything seems to be working as I expected, except mutations. Mutations fail on preflight with a 405 (local development, same server). The only difference between the "before" and "after" of the migration (As well as the only difference to queries) is that mutations are missing a content-type: "json" (See attached). Any idea how I can fix this?

Solution:

Ok .... so for prosterity the issue was in the server API route. it was missing a POST handler. Fixed version: ```tsx import { fetchRequestHandler } from "@trpc/server/adapters/fetch";...

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2 Replies

pupo•5mo ago

export const trpc = createTRPCReact<AppRouter>({
  unstable_overrides: {
    useMutation: {
      async onSuccess(opts) {
        await opts.originalFn();
        await opts.queryClient.invalidateQueries();
      },
    },
  },
});

const getBaseUrl = (): string => {
  const env = getEnvVariableOrDefault("NODE_ENV", "");
  const VERCEL_URL = getEnvVariableOrDefault("VERCEL_URL", "");
  const PORT = getEnvVariableOrDefault("PORT", "3000");

  if (env === "test") return `http://localhost:${PORT}`;

  if (typeof window !== "undefined") return "";

  if (VERCEL_URL) return `https://${VERCEL_URL}`;

  return `http://localhost:${PORT}`;
};

export type TRPCProviderProps = {
  children: ReactNode;
};

export const TrpcProvider: FunctionComponent<TRPCProviderProps> = ({
  children,
}) => {
  const [queryClient] = useState(() => new QueryClient());
  const [trpcClient] = useState(() =>
    trpc.createClient({
      links: [
        loggerLink({
          enabled: () => true,
        }),
        httpBatchLink({
          url: `${getBaseUrl()}/api/trpc2`,
        }),
      ],
      transformer: superJson,
    }),
  );

  return (
    <trpc.Provider client={trpcClient} queryClient={queryClient}>
      <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
    </trpc.Provider>
  );
};

export const trpc = createTRPCReact<AppRouter>({
  unstable_overrides: {
    useMutation: {
      async onSuccess(opts) {
        await opts.originalFn();
        await opts.queryClient.invalidateQueries();
      },
    },
  },
});

const getBaseUrl = (): string => {
  const env = getEnvVariableOrDefault("NODE_ENV", "");
  const VERCEL_URL = getEnvVariableOrDefault("VERCEL_URL", "");
  const PORT = getEnvVariableOrDefault("PORT", "3000");

  if (env === "test") return `http://localhost:${PORT}`;

  if (typeof window !== "undefined") return "";

  if (VERCEL_URL) return `https://${VERCEL_URL}`;

  return `http://localhost:${PORT}`;
};

export type TRPCProviderProps = {
  children: ReactNode;
};

export const TrpcProvider: FunctionComponent<TRPCProviderProps> = ({
  children,
}) => {
  const [queryClient] = useState(() => new QueryClient());
  const [trpcClient] = useState(() =>
    trpc.createClient({
      links: [
        loggerLink({
          enabled: () => true,
        }),
        httpBatchLink({
          url: `${getBaseUrl()}/api/trpc2`,
        }),
      ],
      transformer: superJson,
    }),
  );

  return (
    <trpc.Provider client={trpcClient} queryClient={queryClient}>
      <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
    </trpc.Provider>
  );
};

Since Im not 100% sure if this is an issue with the setup of the client, or the server endpoint, here is the code for the server endpoint:

import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
import { appRouter } from "@cf/providers/trpc";

export const GET = (req: Request) =>
  fetchRequestHandler({
    endpoint: "/api/trpc2",
    router: appRouter,
    req,
    createContext: async () => ({}),
  });

import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
import { appRouter } from "@cf/providers/trpc";

export const GET = (req: Request) =>
  fetchRequestHandler({
    endpoint: "/api/trpc2",
    router: appRouter,
    req,
    createContext: async () => ({}),
  });

Solution

pupo•5mo ago

Ok .... so for prosterity the issue was in the server API route. it was missing a POST handler. Fixed version:

import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
import { appRouter } from "@cf/providers/trpc";

const handler = (req: Request) =>
  fetchRequestHandler({
    endpoint: "/api/trpc2",
    router: appRouter,
    req,
    createContext: async () => ({}),
  });

export const POST = handler;
export const GET = handler;

import { fetchRequestHandler } from "@trpc/server/adapters/fetch";
import { appRouter } from "@cf/providers/trpc";

const handler = (req: Request) =>
  fetchRequestHandler({
    endpoint: "/api/trpc2",
    router: appRouter,
    req,
    createContext: async () => ({}),
  });

export const POST = handler;
export const GET = handler;