Reference Guide

Zend Server Reference Manual
Calculating the Request Signature
The request signature is a 64 digit long hexadecimal number with digits a-f in lower case, calculated using
the following method:
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1. Concatenate the following values in order, separated by a colon (:), into a single string:
a. The exact value of the Host HTTP header. In most cases this will be a string in the form
":". In some cases the colon and port are omitted. In any case, if the port is
included in the Host header sent in the request, it must be included in the generated
string.
b. The Request URI, which is the path part of the full request URL, without the query string
or host name.
c. The exact value of the User-Agent request header.
d. The exact value of the Date request header.
2. Hash the generated string with the HMAC/SHA-256 function using the secret API key to obtain
the request signature.