support customHeader for client

.github/workflows/vulncheck.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [ 1.23.5 ]
+        go-version: [ 1.23.6 ]
     steps:
     - name: Check out code into the Go module directory
       uses: actions/checkout@v4

api.go

@@ -103,6 +103,9 @@ type Client struct {
 
 	trailingHeaderSupport bool
 	maxRetries            int
+
+	// Custom headers to be added to all requests.
+	customHeader http.Header
 }
 
 // Options for New method
@@ -150,6 +153,8 @@ type Options struct {
 	// Number of times a request is retried. Defaults to 10 retries if this option is not configured.
 	// Set to 1 to disable retries.
 	MaxRetries int
+
+	CustomHeader http.Header
 }
 
 // Global constants.
@@ -311,6 +316,9 @@ func privateNew(endpoint string, opts *Options) (*Client, error) {
 		clnt.maxRetries = opts.MaxRetries
 	}
 
+	// Set custom headers
+	clnt.customHeader = opts.CustomHeader
+
 	// Return.
 	return clnt, nil
 }
@@ -881,6 +889,9 @@ func (c *Client) newRequest(ctx context.Context, method string, metadata request
 	c.setUserAgent(req)
 
 	// Set all headers.
+	for k, v := range c.customHeader {
+		req.Header.Set(k, v[0])
+	}
 	for k, v := range metadata.customHeader {
 		req.Header.Set(k, v[0])
 	}