Let’s take a closer look at Google cloud storage Etag.

At Bobcares with our Google cloud platform support Service, we can give you a detailed note on Google cloud storage and Etag.

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ETag

ETag (HTTP Entity Tag) is a one-of-a-kind identifier that is sent in the HTTP header and stored in the browser cache alongside images and other temporary files.  An ETag (entity tag) is an HTTP header to verify that the system is using the most recent version of a record. The ETag is given back as a response header when a GET request is made. The system can also make conditional requests using the ETag.

Generating ETag value

The Etag value generates or updates in both manual and automatic ways.

ETags in Google cloud storage

If the conditions satisfy the ETag header of an object will return the object’s MD5 value:

1. The XML API is to make the request.
2. For server-side encryption, the object only employs Google-managed encryption keys.
3. The object is not composite, and not went under uploading using an XML API multipart upload.

In all other cases, users should make no assumptions about the value of an ETag other than that it changes whenever the underlying data or metadata changes, as specified in the specification. IN the case of Google cloud storage when using the XML API, the same object can have a different ETag value than when using the JSON API.

API for XML Non-composite object ETags change only when the content changes. Whereas composite object and JSON API resource ETags change whenever the content or metadata changes.

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Conclusion

To conclude the Etag generates both automatically and manually. If the conditions on the Google cloud storage satisfy then the MD5 value of an object requite by the ETag header.