fix(http): add timeout support to proxy requests

The previous implementation only added timeout to handleInternalRequest,
but external API requests go through handleProxyRequest which was missing
the timeout logic. This caused the proxy fetch to use default timeout
instead of the user-configured value.

- Add timeout parsing logic to handleProxyRequest
- Add AbortSignal.timeout to proxy fetch call
- Add user-friendly timeout error message

Fixes the issue reported by @ARNOLDAJEE where 600000ms timeout setting
was not taking effect for external API requests.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: majiayu000

apps/sim/tools/index.ts

@@ -893,11 +893,38 @@ async function handleProxyRequest(
     // Check request body size before sending
     validateRequestBodySize(body, requestId, `proxy:${toolId}`)
 
-    const response = await fetch(proxyUrl, {
-      method: 'POST',
-      headers,
-      body,
-    })
+    // Determine timeout for proxy request: use params.timeout if provided, otherwise default
+    // This ensures the proxy fetch itself doesn't timeout before the actual API request
+    const DEFAULT_TIMEOUT_MS = 120000
+    const MAX_TIMEOUT_MS = 600000
+    let timeoutMs = DEFAULT_TIMEOUT_MS
+    if (typeof params.timeout === 'number' && params.timeout > 0) {
+      timeoutMs = Math.min(params.timeout, MAX_TIMEOUT_MS)
+    } else if (typeof params.timeout === 'string') {
+      const parsed = Number.parseInt(params.timeout, 10)
+      if (!Number.isNaN(parsed) && parsed > 0) {
+        timeoutMs = Math.min(parsed, MAX_TIMEOUT_MS)
+      }
+    }
+
+    let response: Response
+    try {
+      response = await fetch(proxyUrl, {
+        method: 'POST',
+        headers,
+        body,
+        signal: AbortSignal.timeout(timeoutMs),
+      })
+    } catch (fetchError) {
+      // Handle timeout error specifically
+      if (fetchError instanceof Error && fetchError.name === 'TimeoutError') {
+        logger.error(`[${requestId}] Proxy request timed out for ${toolId} after ${timeoutMs}ms`)
+        throw new Error(
+          `Request timed out after ${timeoutMs}ms. Consider increasing the timeout value.`
+        )
+      }
+      throw fetchError
+    }
 
     if (!response.ok) {
       // Check for 413 (Entity Too Large) - body size limit exceeded