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CORS ERROR
# support
k
urgent help I need urgent help with this issue. šŸ”— https://staging.sunbasedata.com/sunbase/portal/support/check_files.jsp The URL works fine in a normal browser and allows CORS, but in VPI and testing tools, Iā€™m getting this error: "Network error: Unable to connect to the server. This could be due to CORS restrictions, the server being down, or network connectivity issues." This is just the beginning of our application, and we plan to use VPI extensively. I need this issue resolved as soon as possible. https://cdn.discordapp.com/attachments/1354080404658716724/1354080405216694363/Screenshot_2025-03-19_135455.png?ex=67e3fd26&is=67e2aba6&hm=2253aaecab746c8ea354dae62a86ad672b4e9ac3cd1f5e1c7010b8865712e86c&
v
Hi there! I understand you're facing an urgent CORS error when trying to use your URL with VPI and testing tools, even though it works fine in a normal browser. This can definitely be frustrating, especially when you're planning to use VPI extensively. I'm unable to provide specific information about your sunbasedata.com domain configuration, but I can help with troubleshooting the CORS error you're experiencing with VPI. Based on the information I found, here are several approaches to resolve your issue: ## Server-Side Configuration 1. **Configure CORS Headers on Your Server**: Ensure your server is configured to allow requests from VPI domains by adding the following domains to your CORS whitelist: - 
vapi.ai
- 
*.vapi.ai
[According to documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333797946440941639), whitelisting these domains can resolve CORS issues with VPI. 2. **Check Headers Configuration**: Make sure your server includes the necessary CORS headers in its responses:
Copy code
Access-Control-Allow-Origin: *  (or specifically include vapi.ai domains)
   Access-Control-Allow-Methods: POST, GET, OPTIONS
   Access-Control-Allow-Headers: Content-Type, Authorization, x-vapi-secret
## Tool Configuration in VPI 1. **Server Object Headers**: Configure headers within the server object in your tool configuration:
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json
   {
     server: {
       url: "https://staging.sunbasedata.com/sunbase/portal/support/check_files.jsp",
       headers: {
         // Any required headers
       }
     }
   }
[Documentation indicates](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1342210515883261952) that headers should always be configured within the server object, not directly in the tool configuration.
2. **Set a Secret**: Use the 
assistant.model.tools.server.secret
parameter to set a secret that VPI will send with every request to your server as an 
x-vapi-secret
header. [This can help with authentication](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1331991829717188680). ## Network and Firewall Checks 1. **Verify Network Configuration**: Ensure your network allows outbound connections and that there are no firewalls or proxies blocking the connection to VPI. [Network configuration issues](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333753317490294836) are common causes of CORS errors. 2. **Whitelist IP Ranges**: If your server is behind a firewall, you might need to whitelist the IP ranges used by VPI. ## Testing and Debugging 1. **Test with Postman or cURL**: Use tools like Postman or cURL to manually test your endpoint and see if you can identify specific issues with the request or response. [This can help isolate the problem](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1330221332452999321). 2. **Inspect Network Activity**: Use your browser's developer tools to inspect the network activity when you attempt to create the tool. Look for any failed requests or errors that could provide more insight into what's going wrong. 3. **Implement Logging**: Add logging on both the sending and receiving ends to capture the raw data being transmitted. [This can help identify discrepancies](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1330221332452999321) between what is sent and what is received. Is there any specific part of these suggestions you'd like me to elaborate on further? Sources: - [Discord Thread on CORS Whitelisting](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333797946440941639)
Hi there! I understand you're facing an urgent CORS error when trying to use your URL with VPI and testing tools. This can definitely be frustrating, especially when you're planning to use VPI extensively for your application. I'm unable to provide specific details about your exact VPI setup or the server configuration of staging.sunbasedata.com. However, I can help with troubleshooting steps and potential solutions for the CORS error you're experiencing. ## Potential Reasons for the CORS Error Based on the information I found, here are some possible reasons for the CORS error in VPI: 1. **Network Configuration Issues**: Network settings might be preventing tools from reaching their intended destination. According to [troubleshooting documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333753317490294836), network configuration problems can lead to CORS errors. 2. **Incorrect Headers**: Missing or incorrectly formatted headers are a common cause of CORS errors. Double-check that all necessary headers are included and correctly formatted. 3. **Server-Side Errors**: If there's an error on the server processing the request, it might fail to send back a response, which could manifest as a CORS error. 4. **Authentication Issues**: Incorrect authentication tokens or credentials can sometimes appear as CORS-like errors. ## Troubleshooting Steps Here are some steps you can take to troubleshoot this issue: ### 1. Initial Checks and Connectivity - Verify that your network allows outbound connections to the server - Ensure your internet connection is stable - Check that the URL you're using is correct (which it seems to be since it works in a browser) ### 2. Server-Side and API Checks - Ensure that your route handling server URL events is a 
POST
endpoint (which matches your configuration)
- Headers should always be configured within the server object according to [this source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1341644251510997083) - Double-check that all necessary headers are included and correctly formatted ### 3. Network Configuration and Firewalls - Verify that your network allows WebSocket connections - Check if there are any firewalls or proxies blocking the connection - Make sure that network restrictions are not blocking outgoing connections to 
api.vapi.ai
### 4. Authentication and Security - Verify if there are any additional authentication steps required by VAPI - Check if your API key is correctly configured ## Potential Solutions 1. **Headers Configuration**: Double-check that all necessary headers are included and correctly formatted. A potential workaround for header issues is to use 
x-vapi-secret
for the auth header according to [this source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336715819333193740). 2. **IP Whitelisting**: Ensure that the necessary IP ranges are whitelisted, especially if Cloudflare is used for IP management. 3. **Simple Tool Call**: Try setting up a simple tool call with minimal parameters to see if that works. This can help isolate whether the issue is with the data being sent or the connection itself. 4. **Use Chat Endpoint**: Consider utilizing the chat endpoint to test your agent rather than making a call. 5. Use a webhook instead of the VAPI module as suggested in [this source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334889631333875793). Is there any specific part of these troubleshooting steps you'd like me to elaborate on further? Sources: - [Reasons for CORS errors in VPI and testing tools](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333753317490294836)
- [Solutions for CORS errors in VPI and testing tools](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336715819333193740) - [Troubleshooting "Network error: Unable to connect to the server. This could be due to CORS restrictions, the server being down, or network connectivity issues."](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1341644251510997083) - [Solutions for CORS errors in VPI and testing tools](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334889631333875793)
k
it is working fine with my spring boot based apis but not jsp based but or main appliction is jsp
can you call my api and check if it fullfil all requerments or not
@User please help here!
still waiting for response @User
s
@kanhaiyatiwari looking into it.
k
Hey Kanhaiyatiwari, I just made a request to your server. Share your URL. And it's throwing an error for me as well. So I'll suggest you to allow CORS for all origins and then try again. It will work. You let me know how it goes for you.
k
hi @Shubham Bajaj thank you for helping me but my url already allow CORS i am able to fetch api using postman /and custom js also it is only not working in vapi https://cdn.discordapp.com/attachments/1354080404658716724/1354495188697092229/url_issue_video.mp4?ex=67e57f72&is=67e42df2&hm=afe97cca175e9d27c6acc4988b42ba1e51d2b7bb153645edd264ea9ba98954a2&
s
@kanhaiyatiwari Interesting for us, all of the requests sent out to your server URL are failing, which is why it might end up showing your a general error message.
Can you try one or two calls either using Ngrok or webhooktest.site and see if it's something on your server URL only?
k
hi @Shubham Bajaj Everything is working fine with the others. I also created a separate Spring Boot project, and its URL is working. However, the URL for my main JSP-based application is not working on VPAI. In the VPAI tool's test section, I am not getting a clear error message, so I'm unsure whether it's a server issue, CORS, or something else.
s
@kanhaiyatiwari You might be using some proxy/auth layer in between, which is bouncing the requests.
k
i need to resolve this if there is any extra chares or any thing need to better support i am also oaky for it
@User any update on this
k
Hey Kanhaiyaa, first of all, you don't need to pay anything for the support. Secondly, when you are using other server URLs and it's working, but it's a problem with your server URL. We are not blocking your server URLs. We are not blocking other people's server URLs. If it wasn common, it would've been visible that other people would've been complaining about this. But this is for you. This originates from your server URL only. I completely understand your pain and frustration behind this, but trust me, we're not doing anything wrong.
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