Bug: HTTP Request throws "TypeError: fetch failed" (500) during execution but works in "Test request"

[arbin-mahato]

I am encountering a 500 Internal Server Error with the message Error from Typebot server: TypeError: fetch failed when executing an HTTP Request block during a chat flow (server-side execution).

There is a discrepancy between the builder and the runtime:

Test Mode: Clicking "Test the request" inside the builder succeeds and returns data (Status 200).

Runtime (Preview/Web): The exact same request fails immediately with Status 500.

To Reproduce
Steps to reproduce the behavior:

1. Add an HTTP Request block to the flow.

2. Configure the request:

• Method: POST

• URL: https://countriesnow.space/api/v0.1/countries/cities

• Body: {"country": "India"}

• Execute on client: Unchecked (OFF)

3. Click Test the request inside the configuration panel.

• Observation: Request is successful (Status 200) and returns the JSON list of cities.

4. Close the configuration and click Restart in the Preview panel to run the flow.

5. Observation: The block fails to execute.

Error Log:

  "response": {
    "statusCode": 500,
    "data": {
      "message": "Error from Typebot server: TypeError: fetch failed"
    }
  }
} 

Expected behavior
The HTTP request should execute successfully during the bot runtime (server-side), matching the successful result observed in the "Test the request" feature.

Screen recording

Screen.Recording.2025-12-19.at.12.43.10.PM.mov

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🔗 Similar Issues

Possible Duplicates

• Error from Typebot server: TypeError: fetch failed #1963

Related Issues

• Client-side https request fail due to mix of httpRequestToExecute and webhookToExecute in web.js #1867
• HTTP request executing at the same time #2211
• Dify.ai integration fails with “Agent Chat App does not support blocking mode” in Typebot 3.13.2 #2315
• startChat startFrom command not working #2273
• Error! Could not reach server. Check your connection. {} #1880

👤 Suggested Assignees

• ekkeguembel
• djokafdelpuppo
• kay0ramon
• m4ary
• joaogabrielf

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[baptisteArno]

Hi can you provide a reproduction? A bot json file would be ideal

https://docs.typebot.io/editor/export-import#export-import-a-typebot