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Common Response Headers
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Last updated: 2024-03-28 15:36:00
Common Response Headers
Last updated: 2024-03-28 15:36:00
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Overview

This document describes common response headers that may be used in API requests. The headers mentioned below will not be addressed again in related API documents.

Response Headers

Header
Description
Type
Content-Length
HTTP response length in bytes as defined in RFC 2616
string
Content-Type
HTTP response type (MIME) as defined in RFC 2616.
string
Connection
Indicates whether the network connection will be turned off after the response is complete, defined in RFC 2616. Enumerated values: `keep-alive`, `close`.
enum
Date
Server response time in GMT format as defined in RFC 1123, such as Wed, 29 May 2019 04:10:12 GMT.
string
ETag
An entity tag (ETag) identifies the object content upon creation, and can be used to check whether the object content is changed (for example: "8e0b617ca298a564c3331da28dcb50df"). The value of `ETag` is not necessarily the MD5 checksum of the object. The value will be different if the uploaded object is encrypted. To verify whether the object stored in the cloud is the same as the local one, you are advised to use the CRC64 value in the `x-cos-hash-crc64ecma` header.
string
Last-Modified
The time the object was last uploaded, e.g. Fri, 10 Apr 2020 18:17:25 GMT.
string
Server
Name of the server that accepts the request and returns the response. Default value: tencent-cos.
string
Transfer-Encoding
Transfer encoding format as defined in RFC 2616.
string
x-cos-hash-crc64ecma
CRC64 value of the object. For more information, see [CRC64 Check](https://intl.cloud.tencent.com/document/product/436/34078)
integer
x-cos-request-id
An ID automatically generated by the server for each request when it is sent.
string
x-cos-trace-id
An ID automatically generated by the server for each error when a request fails. This header will be included in the response only if the request has failed.
string


Server-Side Encryption Headers

For APIs that support server-side encryption (SSE) and use SSE in the request, the following response headers will be returned according to the specific encryption method. For more information, see Server-side Encryption Overview.

SSE-COS

Header
Description
Type
x-cos-server-side-encryption
If an object is uploaded with SSE-COS or an object encrypted with SSE-COS is downloaded, the request response will return this header, indicating the server-side encryption algorithm used during object upload.
string


SSE-KMS

Header
Description
Type
x-cos-server-side-encryption-customer-algorithm
If an object is uploaded with SSE-C or an object encrypted with SSE-C is downloaded, the request response will return this header, indicating the server-side encryption algorithm used during object upload
string
x-cos-server-side-encryption-cos-kms-key-id
Returns the customer master key (CMK) of the Key Management Service (KMS), if not specified, the default CMK created by COS will be returned.
string

SSE-C

Header
Description
Type
x-cos-server-side-encryption-customer-algorithm
If an object is uploaded with SSE-C or an object encrypted with SSE-C is downloaded, the request response will return this header, indicating the server-side encryption algorithm used during object upload
string
x-cos-server-side-encryption-customer-key-MD5
Base64-encoded MD5 hash of the server-side encryption key used during object upload, e.g., U5L61r7jcwdNvT7frmUG8g==
string
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