Why HTTP header insertion doesn't insert the HTTP header for long URL?
985
Created On 02/10/23 00:30 AM - Last Modified 03/27/25 21:41 PM
Question
Why HTTP header insertion doesn't insert the HTTP header for long URL? It works fine for most cases, but occasionally it doesn't insert the HTTP header.
Environment
- Prisma Access
- PAN-OS
Answer
- As the above log tells, the header insertion will add an extra 40 bytes to the clear text packet and the packet size will exceed MSS size.
- In such a case, the HTTP header won't be inserted to the packet.
This symptom is observed when the URL length is more than 1336 bytes. - The Domain length limit for header insertion is 256 characters.
Additional Information
Reference Document:
HTTP Header Insertion