In section 3.1.3 and 4.1.2 HMAC examples, I believe the sentence "For an HMAC-based signature without a list of headers specified" should be "For an HMAC-based signature with a list of headers specified" because headers are actually included and "The only difference between the RSA Example and the HMAC Example is the signature algorithm that is used".
In section 3.1.3 and 4.1.2 HMAC examples, I believe the sentence
"For an HMAC-based signature without a list of headers specified"
should be"For an HMAC-based signature with a list of headers specified"
because headers are actually included and"The only difference between the RSA Example and the HMAC Example is the signature algorithm that is used"
.