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Bug: TypeError in WebFetch Tool - undefined response.headers #1720

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opened 2026-02-16 17:32:20 -05:00 by yindo · 4 comments
yindo commented 2026-02-16 17:32:20 -05:00
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Originally created by @sahilchouksey on GitHub (Sep 15, 2025).

Originally assigned to: @thdxr on GitHub.

Issue

TypeError: undefined is not an object (evaluating 'response.headers') when using webfetch tool.

Location

packages/opencode/src/tool/webfetch.ts lines 65 and 76:

const contentLength = response.headers.get("content-length") // Line 65
const contentType = response.headers.get("content-type") || "" // Line 76

Cause

  • fetch() can return undefined when network requests fail
  • Code doesn't validate response object before accessing headers property
  • Results in accessing undefined.headers
Originally created by @sahilchouksey on GitHub (Sep 15, 2025). Originally assigned to: @thdxr on GitHub. ## Issue `TypeError: undefined is not an object (evaluating 'response.headers')` when using webfetch tool. ## Location `packages/opencode/src/tool/webfetch.ts` lines 65 and 76: ```typescript const contentLength = response.headers.get("content-length") // Line 65 const contentType = response.headers.get("content-type") || "" // Line 76 ``` ## Cause - `fetch()` can return `undefined` when network requests fail - Code doesn't validate response object before accessing `headers` property - Results in accessing `undefined.headers`
yindo closed this issue 2026-02-16 17:32:20 -05:00
yindo commented 2026-02-16 17:32:20 -05:00
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@github-actions[bot] commented on GitHub (Sep 15, 2025):

This issue might be a duplicate of existing issues. Please check:

  • #2012: Reports identical error "TypeError: undefined is not an object (evaluating 'response.headers')" when using GitHub Copilot GPT 4o with webfetch tool

Feel free to ignore if none of these address your specific case.

@github-actions[bot] commented on GitHub (Sep 15, 2025): This issue might be a duplicate of existing issues. Please check: - #2012: Reports identical error "TypeError: undefined is not an object (evaluating 'response.headers')" when using GitHub Copilot GPT 4o with webfetch tool Feel free to ignore if none of these address your specific case.
yindo commented 2026-02-16 17:32:20 -05:00
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@rekram1-node commented on GitHub (Sep 15, 2025):

Are you sure this is the webfetch tool? I think this was an auth issue made by your copilot or anthropic plugin

I think you are using copilot or anthropic coding plan right?

@rekram1-node commented on GitHub (Sep 15, 2025): Are you sure this is the webfetch tool? I think this was an auth issue made by your copilot or anthropic plugin I think you are using copilot or anthropic coding plan right?
yindo commented 2026-02-16 17:32:20 -05:00
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@sahilchouksey commented on GitHub (Sep 15, 2025):

Yes, I am using Anthropic Claude Code. It could be related to Claude Code; I will recreate this error and find the module where the error is occurring.

@sahilchouksey commented on GitHub (Sep 15, 2025): Yes, I am using Anthropic Claude Code. It could be related to Claude Code; I will recreate this error and find the module where the error is occurring.
yindo commented 2026-02-16 17:32:20 -05:00
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@rekram1-node commented on GitHub (Sep 15, 2025):

Yeah so this a duplicate of this other issue: https://github.com/sst/opencode/issues/2012

Dax said he would get a fix for it, sometimes you can just get around it by sending a followup message

@rekram1-node commented on GitHub (Sep 15, 2025): Yeah so this a duplicate of this other issue: https://github.com/sst/opencode/issues/2012 Dax said he would get a fix for it, sometimes you can just get around it by sending a followup message
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Reference: anomalyco/opencode#1720
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