Protocol scope and method
SIP Content-Length counts body octets, not JavaScript characters. Line endings before the body are not part of the body length.
actualLength = UTF-8 byte length after the first blank line.
Common questions
Does the SIP Content-Length Checker leave my browser?
No application upload is used. Avoid putting sensitive production data in shareable URLs.
Is this a standards compliance test?
No. Confirm the edition and vendor profile with licensed documents and your target platform.
Offline diagnostic aid. Verify fields, version and vendor extensions before production use.