X-Hub-Signature:

X-Hub-Signature:

[1] Draft: PubSubHubbub Core 0.4 -- Working Draft ( 版) <https://pubsubhubbub.googlecode.com/git/pubsubhubbub-core-0.4.html#authednotify>

The X-Hub-Signature header's value MUST be in the form sha1=signature where signature is a 40-byte, hexadecimal representation of a SHA1 signature [RFC3174]. The signature MUST be computed using the HMAC algorithm [RFC2104] with the request body as the data and the hub.secret as the key.

[2] WebSub () <https://w3c.github.io/websub/#signing-content>