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Function webhook response is empty
# support
h
v
Hi there! I see you're having an issue with your function webhook returning an empty response body despite a 200 status code. I can help you troubleshoot this issue, though I won't be able to identify the exact cause without more details about your specific implementation. Based on the information I found, here are some common causes and debugging steps for this issue: ## Common Causes for Empty Responses 1. **Incorrect Response Format**: The webhook response might not adhere to the expected schema. Ensure your response follows this format:
Copy code
json
   {
     "results": [
       {
         "toolCallId": "<your-tool-call-id>",
         "name": "<your-function-name>",
         "result": "Success" // Or any success message
       }
     ]
   }
[According to user reports](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1342188078437236916), this is the correct format Vapi expects. 2. **Content-Type Header**: Make sure the 
Content-Type
header of your webhook response is set to 
application/json
[as mentioned in troubleshooting guides](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1330221332452999321). 3. **Mismatched `toolCallId`**: The 
toolCallId
in your response must match the one sent by Vapi in the initial request [according to documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1325000684231196775). ## Debugging Steps 1. **Check Serialization**: Ensure your data is properly serialized into a JSON string before being sent [as recommended in support threads](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1330221332452999321). 2. **Test Manually**: Use a tool like Postman or cURL to manually test your webhook endpoint: ```bash curl -X POST \ -H "authorization: Bearer " \ -H "Content-Type: application/json" \ -d '{ "eventType": "test.event", "payload": {
"message": { "toolCalls": [{ "id": "test123", "function": { "name": "test_function", "arguments": {"test": "data"} } }] } } }' ``` 3. **Validate JSON**: Use a JSON validator like [jsonlint.com](https://jsonlint.com/) to check if your JSON response is valid [as suggested by support](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1341460297382236262). 4. **Review Logs**: Check both Vapi logs and your server logs for any error messages or indications of what might be going wrong [according to troubleshooting guides](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452). 5. **Simplify the Scenario**: Try simplifying your webhook to the bare minimum to test connectivity before adding complexity [as recommended in support threads](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452). Is there any specific part of your webhook implementation you'd like me to help with further? Sources: - [Function webhook returning 200 status code but response body is empty](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1337284665580453969) - [Debugging empty responses from function webhooks](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1330221332452999321) - [Common issues that cause empty responses from function webhooks](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336440478727667844) - [Function webhook returning empty response](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1325000684231196775) - [Debugging function webhooks](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452)
h
perfect, I can see the response now, but the ai agent keeps tilling me that i'm registered although i'm not, as showing in the screenshot, how to train the model to understand the data come from the funtion to take action beside on it https://cdn.discordapp.com/attachments/1355326950306222240/1355332358718623855/image.png?ex=67e88b1f&is=67e7399f&hm=11727d2e9cd65d66038afc8d435cbccefd1b2a31f537bb287de242cf1273651c&
k
Hey! To help track down this issue, could you share: - The call ID - When exactly this happened (the timestamp) - What response you expected to get - What response you actually got instead This would really help us figure out what went wrong!
h
-Call ID: call_kvoNyICuISVw9Ns4wllSt00i -This is just now test -expected json: { "results": [ { "toolCallId": "call_kvoNyICuISVw9Ns4wllSt00i", "name": "CheckPhone", "result": "The number calling is registered and caller name is 'Zach Hansen' and the client id="recgT1IzzPB8ssgjR"" } ] }
k
Hey, HiTMaN buddy, you are sharing the tool call ID, not the call ID. To get the call ID, visit the VAPI dashboard and then navigate to the left side. You will find the Observe section at the bottom. Click on it; you will find the Logs tab. Click on it; it will take you to the Call Logs page where you will find the call IDs. Share with me any of the recent call IDs.
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