Merge pull request #261985 from gball14/patch-6

Update front-door-faq.yml

Author: v-regandowner

articles/frontdoor/front-door-faq.yml

@@ -202,6 +202,11 @@ sections:
           
           For more information on Azure Front Door service tags scenarios, see [available service tags](../virtual-network/service-tags-overview.md#available-service-tags).
 
+      - question: |
+          What is the value of header timeout from client to Azure Front Door?
+        answer:  |   
+          Azure Front Door has a 5-second timeout for receiving headers from client. The connection is terminated if the client doesn't send headers within 5 seconds to Azure Front Door after establishing TCP/TLS connection. You can't configure this timeout value.
+
       - question: |
           What is the value of the HTTP keep-alive timeout for Azure Front Door?
         answer:  |