better test endpoint ui

cmd/zrok/endpoint_ui/index.html

@@ -377,10 +377,28 @@
     </div>
     <div id="container">
         <div id="info">
-            <h2>The Current Now is {{ .Now }}</h2>
-            <p>The current 'HOST' header: {{ .Host }}</p>
-            <p>The remote host making the request: {{ .Remote }}</p>
-            <p>This host has these IP addresses: {{ .Ips }}</p>
+            <h2>{{ .Now }}</h2>
+
+            <h3>Local:</h3>
+            <table>
+                <tr><td>Host Header</td><td>{{ .Host }}</td></tr>
+                <tr><td>Remote Address</td><td>{{ .Remote }}</td></tr>
+                <tr><td>Local IP Addresses</td><td>{{ .Ips }}</td></tr>
+            </table>
+
+            <h3>Headers:</h3>
+            <table>
+                {{ range $header, $value := .Headers }}
+                <tr>
+                    <td>{{ $header }}</td>
+                    <td>
+                        {{ range $v := $value }}
+                            {{ $v }}
+                        {{ end }}
+                    </td>
+                </tr>
+                {{ end }}
+            </table>
         </div>
     </div>
 </div>

cmd/zrok/test.go

@@ -56,22 +56,28 @@ func (cmd *testEndpointCommand) run(_ *cobra.Command, _ []string) {
 
 func (cmd *testEndpointCommand) serveIndex(w http.ResponseWriter, r *http.Request) {
 	logrus.Infof("%v {%v} -> /index.html", r.RemoteAddr, r.Host)
-	ed := &endpointData{
-		Now:    time.Now(),
-		Host:   r.Host,
-		Remote: r.RemoteAddr,
-	}
-	ed.getIps()
-	if err := cmd.t.Execute(w, ed); err != nil {
+	if err := cmd.t.Execute(w, newEndpointData(r)); err != nil {
 		log.Error(err)
 	}
 }
 
 type endpointData struct {
-	Now    time.Time
-	Host   string
-	Remote string
-	Ips    string
+	Now     time.Time
+	Host    string
+	Headers map[string][]string
+	Remote  string
+	Ips     string
+}
+
+func newEndpointData(r *http.Request) *endpointData {
+	ed := &endpointData{
+		Now:     time.Now(),
+		Host:    r.Host,
+		Headers: r.Header,
+		Remote:  r.RemoteAddr,
+	}
+	ed.getIps()
+	return ed
 }
 
 func (ed *endpointData) getIps() {