Fetch API Discrepancy

[echo tundra]

Do you have any idea why this server component fetch:

const response = await fetch(http://localhost:8000/topics/Converting%20Mixed%20and%20Improper%20Fractions);

Might be getting a different response (when I check the logs there isn't a 'tags' object in the response.json) compared to this request to my BackEnd made directly from postman, which does show that there is a tags object nested within the topics object?

http://localhost:8000/topics/Converting Mixed and Improper Fractions

I need the tags object to be present to be able to display certain data on my front end.

[reef barn]

Hi @echo tundra. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

---

It seems like you are experiencing a discrepancy between the response received from a fetch request in a Next.js server component and the response received when making the same request directly via Postman. Here are a few potential reasons and steps to troubleshoot:

1. Environment Differences:

   • Ensure that the environment in which your Next.js server is running has the same configuration as your local environment where Postman is making the request. Sometimes, environment variables or network configurations can cause differences in responses.

2. Network Issues:

   • Verify that there are no network issues or proxy settings that might be altering the request or response when made from the Next.js server component.

3. Server Component Fetch Behavior:

   • According to the GitHub Issue #49896 (https://github.com/vercel/next.js/issues/49896), there can be issues with fetch in server components, especially if the URL is not correctly specified. Ensure that the URL is correctly formatted and accessible from the server environment.

4. Build vs. Dev Environment:

   • The behavior might differ between development and production builds. As mentioned in the GitHub Issue #49896 (https://github.com/vercel/next.js/issues/49896), server components might not be able to find certain routes at build time. Ensure that the endpoint is accessible during the build process.

5. Response Handling:

   • Double-check how the response is being handled in your server component. Ensure that you are correctly parsing the JSON response and accessing the nested objects.

Here is a basic example of how you might handle the fetch in a server component:

import { headers } from "next/headers";

export default async function Page() {
const headersData = headers();
const protocol = headersData.get("x-forwarded-proto") || "http";
const host = headersData.get("host") || "localhost:8000";
const response = await fetch(${protocol}://${host}/topics/Converting%20Mixed%20and%20Improper%20Fractions);
const data = await response.json();

if (!data.topics || !data.topics.tags) {
console.error("Tags object is missing in the response");
}

return (
<div>
{/* Render your data here */}
</div>
);
}

If the issue persists, you might want to log the entire response to see if there are any clues:

```javascript
console.log(await response.json());

For further assistance, you can refer to the Next.js documentation (https://nextjs.org/docs) or the relevant GitHub issues mentioned above. If the problem is specific to Vercel deployments, you might also want to check the Vercel documentation (https://vercel.com/docs).

If none of these steps resolve the issue, please provide more details or check the GitHub Issue #49896 (https://github.com/vercel/next.js/issues/49896) for similar problems and potential solutions.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: