[confighttp] Add NewDefaultCORSConfig function to initialize the de…

…fault `confighttp.CORSConfig`

.chloggen/new_cors_default_config.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: confighttp
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add `NewDefaultCORSConfig` function to initialize the default `confighttp.CORSConfig`
+
+# One or more tracking issues or pull requests related to the change
+issues: [9655]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: [api]

config/confighttp/confighttp.go

@@ -476,6 +476,11 @@ type CORSConfig struct {
 	MaxAge int `mapstructure:"max_age"`
 }
 
+// NewDefaultCORSConfig creates a default cross-origin resource sharing (CORS) configuration.
+func NewDefaultCORSConfig() *CORSConfig {
+	return &CORSConfig{}
+}
+
 func authInterceptor(next http.Handler, server auth.Server, requestParams []string) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		sources := r.Header

config/confighttp/confighttp_test.go

@@ -762,7 +762,7 @@ func TestHttpCors(t *testing.T) {
 		},
 		{
 			name:             "emptyCORS",
-			CORSConfig:       &CORSConfig{},
+			CORSConfig:       NewDefaultCORSConfig(),
 			allowedWorks:     false,
 			disallowedWorks:  false,
 			extraHeaderWorks: false,