added response header endpoint

.gitignore

@@ -0,0 +1 @@
+.idea

cmd/server/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"github.com/speakeasy-api/speakeasy-auth-test-service/internal/responseHeaders"
 	"log"
 	"net/http"
 
@@ -16,6 +17,7 @@ func main() {
 	}).Methods(http.MethodGet)
 	r.HandleFunc("/auth", auth.HandleAuth).Methods(http.MethodPost)
 	r.HandleFunc("/requestbody", requestbody.HandleRequestBody).Methods(http.MethodPost)
+	r.HandleFunc("/vendorjson", responseHeaders.HandleVendorJsonResponseHeaders).Methods(http.MethodGet)
 
 	log.Println("Listening on :8080")
 	if err := http.ListenAndServe(":8080", r); err != nil {

internal/responseHeaders/service.go

@@ -0,0 +1,28 @@
+package responseHeaders
+
+import (
+	"encoding/json"
+	"github.com/speakeasy-api/speakeasy-auth-test-service/internal/utils"
+	"io"
+	"net/http"
+)
+
+func HandleVendorJsonResponseHeaders(w http.ResponseWriter, r *http.Request) {
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		utils.HandleError(w, err)
+		return
+	}
+
+	var req interface{}
+	if err := json.Unmarshal(body, &req); err != nil {
+		utils.HandleError(w, err)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/vnd.api+json; charset=utf-8")
+
+	if err := json.NewEncoder(w).Encode(req); err != nil {
+		utils.HandleError(w, err)
+	}
+}