PUT Object

Use a PUT object request to:

• Upload an Object
• Upload an Object Part
• Copy an Object
• Compose an Object
• Set Object ACLs
• Set Object Retention

Common request headers

The following are common request headers for PUT object requests.

Header	Description	Required
Authorization	The authentication string for the request.	Yes
Content-Length	The length of the request body without headers (in bytes).	Yes 1
Content-Type 2	The MIME type of the request body. If you do not specify a content type, Cloud Storage defaults to application/octet-stream when it serves the object.	No (recommended)
Content-MD5	The MD5 digest of the request message without headers. While not required, this header is generally recommended as a data integrity check to verify that the data received by Cloud Storage is the same as the data that was intended to be sent.	No
Date	The date and time of the request.	Yes
Host	The URI for Cloud Storage. For more information, see Request Endpoints .	Yes
Transfer-Encoding	Indicates if the message body was chunked. In requests that use V4 Signatures for their authentication, chunked uploads must also include the header x-amz-decoded-content-length .	No (except for requests that use chunked transfer encoding)
x-goog-if-generation-match 2	If the generation you specify is the same as the object you're replacing, then the object is replaced. You can also specify 0 as a special value to indicate that the new object is only created if there is no existing object.	No
x-goog-if-metageneration-match 2	If the metageneration you specify is the same as the object you're trying to update, then the object metadata is updated. This is only allowed if x-goog-if-generation is specified. By combining these two generation properties, you can implement safe read-modify-write updates.	No
x-goog-storage-class 2	Gives an object a storage class besides the default storage class of the associated bucket.	No
x-goog-user-project	The project to be billed for charges associated with the request.	No

¹ Not required for requests that use chunked transfer encoding.

² This header is not applicable in PUT Object requests that upload an object part .