For Application gateway with WAF_V2 SKU, it is now in public Preview to increase the request body size to 2000KB(2MB) as long as we are using OWASP 3.2 in the WAF.

For Application gateway with WAF_V2 SKU, it is now in public Preview to increase the request body size to 2000KB(2MB) as long as we are using OWASP 3.2 in the WAF.

Recommended size is 128k.