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feat(client): HTTP Headers Support for SSE MCP Client at Start #122

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feat(client): HTTP Headers Support for SSE MCP Client at Start #122

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6d0b954
Add custom headers at the start of the SSE client
k33g Apr 8, 2025
a2d8ace
Add custom headers in Initialize. Add comment to WithHeaders. Add hea…
k33g Apr 13, 2025
da33720
Standardize comments. Add Example comment. Add header conflict protec…
k33g Apr 13, 2025
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38 changes: 37 additions & 1 deletion client/sse.go
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,9 @@ type SSEMCPClient struct {

type ClientOption func(*SSEMCPClient)

// WithHeaders sets custom HTTP headers that will be included in all requests made by the client.
// This is particularly useful for authentication (e.g., bearer tokens, API keys) and other
// custom header requirements.
func WithHeaders(headers map[string]string) ClientOption {
return func(sc *SSEMCPClient) {
sc.headers = headers
Expand All @@ -55,6 +58,15 @@ func WithSSEReadTimeout(timeout time.Duration) ClientOption {

// NewSSEMCPClient creates a new SSE-based MCP client with the given base URL.
// Returns an error if the URL is invalid.
// Example:
//
// // Create a client with authentication headers
// client, err := NewSSEMCPClient(
// "https://mcp.example.com",
// WithHeaders(map[string]string{
// "Authorization": "Bearer your-token-here",
// }),
// )
func NewSSEMCPClient(baseURL string, options ...ClientOption) (*SSEMCPClient, error) {
parsedURL, err := url.Parse(baseURL)
if err != nil {
Expand Down Expand Up @@ -94,6 +106,16 @@ func (c *SSEMCPClient) Start(ctx context.Context) error {
req.Header.Set("Cache-Control", "no-cache")
req.Header.Set("Connection", "keep-alive")

// Set custom http headers
for k, v := range c.headers {
// Skip standard headers that should not be overridden
switch k {
case "Accept", "Cache-Control", "Connection", "Content-Type":
continue
}
req.Header.Set(k, v)
}

resp, err := c.httpClient.Do(req)
if err != nil {
return fmt.Errorf("failed to connect to SSE stream: %w", err)
Expand Down Expand Up @@ -301,8 +323,13 @@ func (c *SSEMCPClient) sendRequest(
}

req.Header.Set("Content-Type", "application/json")
// set custom http headers
// Set custom http headers
for k, v := range c.headers {
// Skip standard headers that should not be overridden
switch k {
case "Accept", "Cache-Control", "Connection", "Content-Type":
continue
}
req.Header.Set(k, v)
}

Expand Down Expand Up @@ -391,6 +418,15 @@ func (c *SSEMCPClient) Initialize(
}

req.Header.Set("Content-Type", "application/json")
// Set custom http headers
for k, v := range c.headers {
// Skip standard headers that should not be overridden
switch k {
case "Accept", "Cache-Control", "Connection", "Content-Type":
continue
}
req.Header.Set(k, v)
}

resp, err := c.httpClient.Do(req)
if err != nil {
Expand Down