ComposioHQ/composio · error · Error

Failed to fetch file: ${response.statusText}

Error message

Failed to fetch file: ${response.statusText}

What it means

Thrown when the SSRF-guarded fetch of a remote file URL returns a non-OK HTTP status. The response body is explicitly cancelled before throwing, and only statusText is surfaced.

Source

Thrown at ts/packages/core/src/utils/fileUtils.node.ts:182

    };
  } catch (error) {
    throw new Error(`Error reading file at ${filePath}: ${error}`);
  }
};

const readFileContentFromURL = async (
  path: string,
  signal?: AbortSignal
): Promise<{ fileName: string; content: string; mimeType: string }> => {
  // SSRF guard: `path` is user-supplied (and can come from an LLM-produced tool
  // argument), so it must not be allowed to reach internal/private addresses or
  // redirect into them. See ssrfGuard.node.ts.
  const response = await ssrfSafeFetch(path, { signal });
  if (!response.ok) {
    // The error path never reads the body, so release it explicitly (mirrors
    // `readResponseBodyWithLimit`) instead of leaving it to the garbage collector.
    await response.body?.cancel().catch(() => undefined);
    throw new Error(`Failed to fetch file: ${response.statusText}`);
  }
  const content = await readResponseBodyWithLimit(response);
  const mimeType = response.headers.get('content-type') || 'application/octet-stream';

  // Extract clean filename from URL, removing query parameters
  const url = new URL(path);
  const pathname = url.pathname;
  let fileName = platform.basename(pathname);

  // If no filename from URL, generate one with appropriate extension
  if (!fileName || fileName === '/') {
    // Try to get extension from mimeType
    const extension = getExtensionFromMimeType(mimeType);
    fileName = generateTimestampedFilename(extension);
  } else {
    // If filename has no extension, try to add one from mimeType
    const hasExtension = fileName.includes('.');
    if (!hasExtension) {

View on GitHub (pinned to 64b1b85502)

Solutions

1. Retry with backoff for transient 5xx/429 statuses.
2. Verify the URL opens in curl/browser; re-generate expired signed links.
3. Ensure the URL is publicly reachable without cookies/auth if the endpoint needs them.

const ok = await fetch(url, { method: 'HEAD' }).then(r => r.ok).catch(() => false);

try { await readFile(url); } catch (e) {
  if ((e as Error).message.startsWith('Failed to fetch file:')) { /* retry or refresh URL */ }
}

When it happens

Trigger: Passing an http(s) URL to readFile/getFileDataAfterUploadingToS3 where the server responds 4xx/5xx: expired signed S3 links (403), removed files (404), or rate limiting.

Common situations: Expired pre-signed URLs, mistyped domains, servers requiring auth headers the SDK does not send, or transient 5xx from object storage.

Understand the failure class

Background: 'Something went wrong' / 'Request failed (500)' / 'HTTP error! status: 404' — what failed HTTP requests actually mean and how to find the real cause — this error's family across 28 libraries.

Related errors

• Failed to fetch file: ${response.statusText}
• Refusing to fetch: too many redirects (max {max_redirects})
• Failed to upload file to S3: ${uploadResponse.statusText}
• Failed to fetch toolkits
• Couldn't fetch Toolkit with slug: ${slug}

AI-assisted analysis of ComposioHQ/composio@64b1b85502 (2026-08-28). Data as JSON: /api/errors/e75ba1ccca63a7cf. Report an issue: GitHub.