diff --git a/cmd/camera-streamer.c b/cmd/camera-streamer.c
index b16925d..2a108e1 100644
--- a/cmd/camera-streamer.c
+++ b/cmd/camera-streamer.c
@@ -14,6 +14,22 @@ extern unsigned int html_video_html_len;
 extern unsigned char html_jmuxer_min_js[];
 extern unsigned int html_jmuxer_min_js_len;
 
+camera_t *camera;
+
+void camera_http_option(http_worker_t *worker, FILE *stream)
+{
+  if (strstr(worker->client_method, "autofocus")) {
+    if (camera && !device_set_option_string(camera->camera, "AfTrigger", "1")) {
+      http_200(stream, "Auto-focus triggered.\r\n");
+    } else {
+      http_500(stream, "Cannot set auto-focus.\r\n");
+    }
+    return;
+  }
+
+  http_404(stream, "No option found.\r\n");
+}
+
 http_method_t http_methods[] = {
   { "GET /snapshot?", http_snapshot },
   { "GET /stream?", http_stream },
@@ -23,6 +39,7 @@ http_method_t http_methods[] = {
   { "GET /video.h264?", http_h264_video },
   { "GET /video.mkv?", http_mkv_video },
   { "GET /video.mp4?", http_mp4_video },
+  { "GET /option?", camera_http_option },
   { "GET /jmuxer.min.js?", http_content, "text/javascript", html_jmuxer_min_js, 0, &html_jmuxer_min_js_len },
   { "GET /?", http_content, "text/html", html_index_html, 0, &html_index_html_len },
   { }
@@ -130,10 +147,10 @@ int main(int argc, char *argv[])
   }
 
   while (true) {
-    camera_t *camera = camera_open(&camera_options);
+    camera = camera_open(&camera_options);
     if (camera) {
       ret = camera_run(camera);
-      camera_close(camera);
+      camera_close(&camera);
     }
 
     if (camera_options.auto_reconnect > 0) {
diff --git a/device/camera/camera.c b/device/camera/camera.c
index a780023..087b901 100644
--- a/device/camera/camera.c
+++ b/device/camera/camera.c
@@ -25,15 +25,18 @@ camera_t *camera_open(camera_options_t *options)
   return camera;
 
 error:
-  camera_close(camera);
+  camera_close(&camera);
   return NULL;
 }
 
-void camera_close(camera_t *camera)
+void camera_close(camera_t **camerap)
 {
-  if (!camera)
+  if (!camerap || !*camerap)
     return;
 
+  camera_t *camera = *camerap;
+  *camerap = NULL;
+
   for (int i = MAX_DEVICES; i-- > 0; ) {
     if (camera->devices[i]) {
       device_close(camera->devices[i]);
diff --git a/device/camera/camera.h b/device/camera/camera.h
index d1ab85c..db429de 100644
--- a/device/camera/camera.h
+++ b/device/camera/camera.h
@@ -64,7 +64,7 @@ typedef struct camera_s {
 
 camera_t *camera_open(camera_options_t *camera);
 int camera_set_params(camera_t *camera);
-void camera_close(camera_t *camera);
+void camera_close(camera_t **camera);
 int camera_run(camera_t *camera);
 
 link_t *camera_ensure_capture(camera_t *camera, buffer_list_t *capture);
diff --git a/device/libcamera/device.cc b/device/libcamera/device.cc
index 667f38d..867dc7b 100644
--- a/device/libcamera/device.cc
+++ b/device/libcamera/device.cc
@@ -7,9 +7,14 @@ std::string libcamera_device_option_normalize(std::string key)
   return key;
 }
 
-libcamera::ControlInfoMap libcamera_control_list(device_t *dev)
+libcamera::ControlInfoMap::Map libcamera_control_list(device_t *dev)
 {
-  return dev->libcamera->camera->controls();
+  libcamera::ControlInfoMap::Map controls_map;
+  for (auto const &control : dev->libcamera->camera->controls()) {
+    controls_map[control.first] = control.second;
+  }
+  controls_map[&libcamera::controls::draft::AfTrigger] = libcamera::ControlInfo();
+  return controls_map;
 }
 
 int libcamera_device_open(device_t *dev)
diff --git a/html/index.html b/html/index.html
index 3536669..2b28031 100644
--- a/html/index.html
+++ b/html/index.html
@@ -50,6 +50,14 @@
 				<li><a href="video?res=low">/video?res=low</a> get a low resolution stream (if -camera-low_res_factor=X is configured).</li>
 			</ul>
 		</li>
+		<br>
+		<li>
+			The commands available on some cameras:<br>
+			<br>
+			<ul>
+				<li><a href="option?autofocus">/option?autofocus</a> trigger auto focus.</li>
+			</ul>
+		</li>
 	</ul>
 	<br>
 	<hr>
diff --git a/http/http.h b/http/http.h
index f4a0b76..e36d639 100644
--- a/http/http.h
+++ b/http/http.h
@@ -45,6 +45,7 @@ typedef struct http_server_options_s {
 
 int http_server(http_server_options_t *options, http_method_t *methods);
 void http_content(http_worker_t *worker, FILE *stream);
+void http_200(FILE *stream, const char *data);
 void http_404(FILE *stream, const char *data);
 void http_500(FILE *stream, const char *data);
 
@@ -54,6 +55,7 @@ void http_stream(http_worker_t *worker, FILE *stream);
 void http_jpeg_capture(struct buffer_s *buf);
 void http_jpeg_lowres_capture(struct buffer_s *buf);
 bool http_jpeg_needs_buffer();
+void http_option(http_worker_t *worker, FILE *stream);
 
 // H264
 bool http_h264_needs_buffer();
diff --git a/http/http_methods.c b/http/http_methods.c
index a3d037f..0004d54 100644
--- a/http/http_methods.c
+++ b/http/http_methods.c
@@ -16,7 +16,7 @@ static void http_write_response(
   fprintf(stream, "HTTP/1.1 %s\r\n", status ? status : "200 OK");
   fprintf(stream, "Content-Type: %s\r\n", content_type ? content_type : "text/plain");
   if (content_length > 0)
-    fprintf(stream, "Content-Type: %d\r\n", content_length);
+    fprintf(stream, "Content-Length: %d\r\n", content_length);
   fprintf(stream, "\r\n");
   if (body) {
     fwrite(body, 1, content_length, stream);
@@ -41,6 +41,11 @@ void http_content(http_worker_t *worker, FILE *stream)
   }
 }
 
+void http_200(FILE *stream, const char *data)
+{
+  http_write_response(stream, "200 OK", NULL, data ? data : "Nothing here.\n", 0);
+}
+
 void http_404(FILE *stream, const char *data)
 {
   http_write_response(stream, "404 Not Found", NULL, data ? data : "Nothing here.\n", 0);