Update.

src/module/web.wren

@@ -1,5 +1,6 @@
 // retoor <retoor@molodetz.nl>
 
+import "scheduler" for Scheduler
 import "net" for Socket, Server
 import "tls" for TlsSocket
 import "dns" for Dns
@@ -827,8 +828,25 @@ class Application {
     while (true) {
       var socket = server.accept()
       if (socket == null) continue
+      var self = this
+      Scheduler.add {
+        self.handleConnectionSafe_(socket)
+      }
+    }
+  }
+
+  handleConnectionSafe_(socket) {
+    var fiber = Fiber.new {
       handleConnection_(socket)
     }
+    var error = fiber.try()
+    if (error != null) {
+      var response = Response.new()
+      response.status = 500
+      response.body = "Internal Server Error"
+      Fiber.new { socket.write(response.build()) }.try()
+      Fiber.new { socket.close() }.try()
+    }
   }
 
   handleConnection_(socket) {

src/module/web.wren.inc

@@ -4,6 +4,7 @@
 static const char* webModuleSource =
 "// retoor <retoor@molodetz.nl>\n"
 "\n"
+"import \"scheduler\" for Scheduler\n"
 "import \"net\" for Socket, Server\n"
 "import \"tls\" for TlsSocket\n"
 "import \"dns\" for Dns\n"
@@ -831,8 +832,25 @@ static const char* webModuleSource =
 "    while (true) {\n"
 "      var socket = server.accept()\n"
 "      if (socket == null) continue\n"
+"      var self = this\n"
+"      Scheduler.add {\n"
+"        self.handleConnectionSafe_(socket)\n"
+"      }\n"
+"    }\n"
+"  }\n"
+"\n"
+"  handleConnectionSafe_(socket) {\n"
+"    var fiber = Fiber.new {\n"
 "      handleConnection_(socket)\n"
 "    }\n"
+"    var error = fiber.try()\n"
+"    if (error != null) {\n"
+"      var response = Response.new()\n"
+"      response.status = 500\n"
+"      response.body = \"Internal Server Error\"\n"
+"      Fiber.new { socket.write(response.build()) }.try()\n"
+"      Fiber.new { socket.close() }.try()\n"
+"    }\n"
 "  }\n"
 "\n"
 "  handleConnection_(socket) {\n"