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Fix 405 error when connecting to servers requiring Accept header #79

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Fix 405 error when connecting to servers requiring Accept header #79

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20 changes: 9 additions & 11 deletions cmd/mcptools/commands/utils.go
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Original file line number Diff line number Diff line change
Expand Up @@ -116,26 +116,24 @@ var CreateClientFunc = func(args []string, _ ...client.ClientOption) (*client.Cl
return nil, fmt.Errorf("failed to parse authentication: %w", authErr)
}

// Create headers map if authentication is provided
// Create headers map with required Accept header for MCP protocol
headers := make(map[string]string)

// Add authentication header if provided
if authHeader != "" {
headers["Authorization"] = authHeader
}

// Add Accept header required by MCP streamable HTTP and SSE transports
// Many MCP servers require clients to accept both JSON responses and event streams
headers["Accept"] = "application/json, text/event-stream"

if TransportOption == "sse" {
// For SSE transport, use transport.ClientOption
if len(headers) > 0 {
c, err = client.NewSSEMCPClient(cleanURL, transport.WithHeaders(headers))
} else {
c, err = client.NewSSEMCPClient(cleanURL)
}
c, err = client.NewSSEMCPClient(cleanURL, transport.WithHeaders(headers))
} else {
// For StreamableHTTP transport, use transport.StreamableHTTPCOption
if len(headers) > 0 {
c, err = client.NewStreamableHttpClient(cleanURL, transport.WithHTTPHeaders(headers))
} else {
c, err = client.NewStreamableHttpClient(cleanURL)
}
c, err = client.NewStreamableHttpClient(cleanURL, transport.WithHTTPHeaders(headers))
}

if err != nil {
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