HTTP headers | Digest

Last Updated : 31 Oct, 2019

The Digest HTTP header is a response HTTP header that provides the requested resource with a small value generated by a hash function from a whole message. The Digest HTTP header is a response header that provides a digest of the requested resource. The entire representation is used to calculate the digest. Multiple digest values for a single resource is also possible as the representation depends on Content-Type and Content-Encoding.

Syntax:

Digest:<digest-algorithm>=<digest-value>

Directives: This header accepts two directives as mentioned above and described below:

<digest-algorithm>: It contains defined supported algorithms, example SHA-256 and SHA-512.
<digest-value>: It holds the result of encoding and applying the digest algorithm to the resource representation.

Examples:

It provides the resource with the sha-256 algorithm and also provides the digest value.
```
Digest: sha-256=nOJRJgeeksforgeeksN3OWDUo9DBPE=
```
It provides the resource with the sha-512 algorithm and also provides the digest value. In addition to that, it provides UNIX sum algorithm which is subject to collisions.
```
Digest: sha-512=\vdtgeeksforgeeks8nOJRJN3OWDDBPE=, unixsum=69
```

Supported Browsers: The browsers are compatible with HTTP Digest header are listed below: