Nuxt•3d ago

Missing custom header when calling API from mounted() hook in NUXT2

I have a component inside a NUXT2.17.0 project. When I call an API inside that component, this API should return a custom header. If I do the call inside an fetch() hook, it returns that custom header. But if I call the API inside the mounted()-hook no custom headers are included. It doesn't matter if I use axios or fetch native. None of them works, so it must be something with the lifecycle mounted. Someone has an idea? Thanks

11 Replies

kapa.ai•3d ago

Hi @th1nkgr33n. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- I apologize, but I don't have enough specific information about Nuxt 2 in the provided knowledge sources to answer your question accurately. The documents mainly focus on Nuxt 3 and don't cover the specific behavior you're describing in Nuxt 2.17.0. However, I can provide some general insights based on Nuxt 3 behavior, which might be helpful: 1. In Nuxt 3, when making server-side requests, you need to manually forward headers using utilities like useRequestHeaders() or useRequestFetch() as described in the Nuxt 3 documentation (https://nuxt.com/docs/getting-started/data-fetching#passing-headers-and-cookies). 2. The mounted() hook runs only on the client-side, which might explain why you're not seeing the custom headers when making the API call there. 3. In Nuxt 3, it's recommended to use composables like useFetch() or useAsyncData() for data fetching, which automatically handle header forwarding as mentioned in the Nuxt 3 docs (https://nuxt.com/docs/api/composables/use-fetch). However, since you're using Nuxt 2, these solutions might not directly apply. I recommend checking the Nuxt 2 documentation or seeking help from the Nuxt 2 community forums for a more accurate answer to your specific Nuxt 2 issue. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•3d ago

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th1nkgr33nOP•3d ago

What about 2.) why does client-side calls make a different here? @kapa.ai What about 2.) why does client-side calls make a different here?

kapa.ai•3d ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- To answer your question about why client-side calls make a difference in this context, let's examine the behavior of server-side and client-side requests in Nuxt: 1. Server-side requests: When a request is made during server-side rendering (SSR), such as in the fetch() hook, the server needs to manually forward the headers. This is because the request is being made on the server, and the original client headers are not automatically included. 2. Client-side requests: When a request is made on the client-side, such as in the mounted() hook, the browser automatically sends the necessary headers as mentioned in the Nuxt 3 documentation (https://nuxt.com/docs/api/composables/use-request-fetch). This is standard browser behavior and not specific to Nuxt. The key difference lies in how headers are handled in these two environments: - On the server, Nuxt needs to explicitly forward headers to ensure they're included in the request. - In the browser, headers are automatically managed by the browser's networking stack. This explains why you might see different behavior when making requests in the fetch() hook (server-side) versus the mounted() hook (client-side). The server-side request in fetch() includes the custom headers because Nuxt is handling the header forwarding, while the client-side request in mounted() relies on the browser's default behavior. It's worth noting that in Nuxt 3, composables like useFetch() and useAsyncData() are designed to handle this difference automatically, ensuring consistent behavior across server and client environments as explained in the Nuxt 3 data fetching guide (https://nuxt.com/docs/getting-started/data-fetching#the-need-for-usefetch-and-useasyncdata). However, since you're using Nuxt 2, the exact behavior might differ. In Nuxt 2, you might need to manually handle header forwarding for server-side requests, which could explain the discrepancy you're experiencing between fetch() and mounted() hooks. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•3d ago

<@771303479154704405> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

th1nkgr33nOP•3d ago

@kapa.ai My Problem ist not the forwarding something along with the request. Its the response where the header are missing

kapa.ai•3d ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- I apologize for the misunderstanding. Let me clarify the issue regarding missing response headers in Nuxt. In Nuxt, there can indeed be differences in how response headers are handled between server-side and client-side requests. This behavior is related to how Nuxt handles the response data and headers in different environments. For server-side requests (like those in the fetch() hook): Nuxt has more control over the response and can preserve all headers received from the API. This is why you're able to see the custom headers when making the request in the fetch() hook. For client-side requests (like those in the mounted() hook): The browser's networking stack handles the request, and some headers might be filtered out or not made accessible due to security policies or browser behavior. This could explain why you're not seeing the custom headers in the response when making the request from the mounted() hook. To address this issue in Nuxt 3, you could use the useFetch() composable, which provides a consistent way to handle both request and response headers across server and client environments. For example:

const { data, error, headers } = await useFetch('/api/endpoint', {
  onResponse({ response }) {
    // Access all response headers here
    console.log(response.headers)
  }
})

const { data, error, headers } = await useFetch('/api/endpoint', {
  onResponse({ response }) {
    // Access all response headers here
    console.log(response.headers)
  }
})

This approach allows you to access the full set of response headers, including custom ones as described in the Nuxt 3 useFetch documentation (https://nuxt.com/docs/api/composables/use-fetch). However, since you're using Nuxt 2, the solution might be different. In Nuxt 2, you might need to use a custom plugin or middleware to ensure that all response headers are preserved and accessible in both server-side and client-side environments. Unfortunately, I don't have specific information about handling this in Nuxt 2 in the provided knowledge sources. I recommend checking the Nuxt 2 documentation or seeking advice from the Nuxt 2 community forums for a more precise solution to your specific version and use case. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•3d ago

<@771303479154704405> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

th1nkgr33nOP•3d ago

@kapa.ai Thanks

kapa.ai•3d ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- You're welcome! I'm glad I could provide some clarification on the issue of response headers in Nuxt. If you have any more questions about Nuxt, feel free to ask. I'm here to help! ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•3d ago

<@771303479154704405> Kapa.ai is still learning and improving, please let me know how I did by reacting below.

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Missing custom header when calling API from mounted() hook in NUXT2