Content-MD5

Content-MD5

 

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The Content-MD5 header is used by servers to provide a message-integrity check for the message body. Only an origin server or requesting client should insert a Content-MD5 header in the message. The value of the header is an MD5 digest^[6]of the (potentially encoded) message body.

^[6] The MD5 digest is defined in RFC 1864.

The value of this header allows for an end-to-end check on the data, useful for detecting unintentional modifications to the data in transit. It is not intended to be used for security purposes.

RFC 1864 defines this header in more detail.

Type

Entity header

Notes

The MD5 digest value is a base-64 (see Appendix E) or 128-bit MD5 digest, as defined in RFC 1864.

Basic Syntax

Content-MD5: md5-digest

Example

Content-MD5: Q2h1Y2sgSW51ZwDIAXR5IQ==