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This section details on the original issue you should resolve

<issue_title>[duplicate-code] Duplicate Code Pattern: HTTP Connection Error Checking</issue_title>
<issue_description># 🔍 Duplicate Code Pattern: HTTP Connection Error Checking

Part of duplicate code analysis: #739

Summary

Duplicated HTTP connection error detection logic in internal/mcp/connection.go. The same error checking pattern (connection refused, no such host, network unreachable) appears in two methods with identical string matching logic.

Duplication Details

Pattern: HTTP Connection Error Detection

• Severity: Medium

• Occurrences: 2 instances in the same file

• Locations:

  • internal/mcp/connection.go (lines 587-590) - in initializeHTTPSession
  • internal/mcp/connection.go (lines 701-704) - in sendHTTPRequest

• Code Sample:

  // Duplicated in initializeHTTPSession (lines 587-590)
  if strings.Contains(err.Error(), "connection refused") ||
      strings.Contains(err.Error(), "no such host") ||
      strings.Contains(err.Error(), "network is unreachable") {
      return "", fmt.Errorf("cannot connect to HTTP backend at %s: %w", c.httpURL, err)
  }
  
  // Duplicated in sendHTTPRequest (lines 701-704)
  if strings.Contains(err.Error(), "connection refused") ||
      strings.Contains(err.Error(), "no such host") ||
      strings.Contains(err.Error(), "network is unreachable") {
      return nil, fmt.Errorf("cannot connect to HTTP backend at %s: %w", c.httpURL, err)
  }

Impact Analysis

• Maintainability: Adding new error types requires updating multiple locations
• Bug Risk: Inconsistent error handling if one location is updated but not the other
• Code Bloat: ~8 lines of duplicated logic

Refactoring Recommendations

1. Extract to Helper Function

   • Extract to: internal/mcp/connection.go (add helper method)
   • Estimated effort: 15 minutes
   • Benefits: Single source of truth for connection error detection

   // isConnectionError checks if an error indicates a connection failure
   func isConnectionError(err error) bool {
       if err == nil {
           return false
       }
       errStr := err.Error()
       return strings.Contains(errStr, "connection refused") ||
              strings.Contains(errStr, "no such host") ||
              strings.Contains(errStr, "network is unreachable")
   }
   
   // Usage in both methods:
   if isConnectionError(err) {
       return nil, fmt.Errorf("cannot connect to HTTP backend at %s: %w", c.httpURL, err)
   }

Implementation Checklist

• Review duplication findings
• Create isConnectionError helper function in internal/mcp/connection.go
• Replace both duplicated checks with helper calls
• Run make test-all to verify no functionality broken
• Consider adding tests for the new helper function
• Run make agent-finished before completion

Parent Issue

See parent analysis report: #739
Related to #739

AI generated by Duplicate Code Detector

• expires on Feb 13, 2026, 3:07 AM UTC

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