This API is used to download an object to the local file system. To make this request, you need to have read permission for the object, or the object must have public read permission enabled (i.e., everyone has permission to read the object).
If the
response-*request parameter is used, this request operation will not support anonymous requests and will have to carry a signature.
With versioning enabled, you can specify the versionId request parameter to get a specific version of an object. If the version ID you specify corresponds to a delete marker, an HTTP 404 status code (Not Found) will be returned. If no version ID is specified, the latest version will be returned.
If this API is used to get an archived object, and the object has not been restored using POST Object restore or the restored copy has been deleted after expiration, the request will return an HTTP 403 status code (Forbidden) and include an error message in the response body. The error code will be InvalidObjectState, indicating that you cannot get the object in its current state with this API and you must restore it first.
GET /<ObjectKey> HTTP/1.1
Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
Date: GMT Date
Authorization: Auth StringAuthorization: Auth String (see Request Signature for details).
| Name | Description | Type | Required |
|---|---|---|---|
| response-cache-control | Sets the value of the Cache-Control header in the response |
string | No |
| response-content-disposition | Sets the value of the Content-Disposition header in the response |
string | No |
| response-content-encoding | Sets the value of the Content-Encoding header in the response |
string | No |
| response-content-language | Sets the value of the Content-Language header in the response |
string | No |
| response-content-type | Sets the value of the Content-Type header in the response |
string | No |
| response-expires | Sets the value of the Expires header in the response |
string | No |
| versionId | Specifies the version ID of the object if versioning is enabled; if this parameter is not specified, the latest version will be downloaded | string | No |
In addition to common request headers, this API also supports the following request headers. For more information on common request headers, see Common Request Headers.
| Name | Description | Type | Required |
|---|---|---|---|
| Range | Byte range of the object as defined in RFC 2616. You can specify only one byte range in the format of bytes=first-last, where both first and last are offsets starting from 0. For example, bytes=0-9 downloads the first 10 bytes of data of the source object, and bytes=5-9 downloads the 6th to 10th bytes. In these cases, HTTP 206 (Partial Content) is returned with Content-Range header.If first exceeds the object size, HTTP error 416 (Requested Range Not Satisfiable) is returned. If this parameter is not specified, the entire object will be downloaded. |
string | No |
| If-Unmodified-Since | If the object is not modified after the specified time, the object will be returned; otherwise, HTTP status code 412 (Precondition Failed) will be returned. |
string | No |
| If-Match | If the ETag of the object is the same as the specified value, the object will be returned; otherwise, HTTP status code 412 (Precondition Failed) will be returned. |
string | No |
| If-None-Match | If the ETag of the object is different from the specified value, the object will be returned; otherwise, HTTP status code 304 (Not Modified) will be returned. |
string | No |
| x-cos-traffic-limit | Specifies the traffic limit in bit/s on this upload. Value range: 819200-838860800, that is, 100 KB/s-100 MB/s. if this range is exceeded, a 400 error will be returned | integer | No |
Server-side Encryption Headers
If server-side encryption is used for the specified object and the encryption method is SSE-C, you will need to specify the headers related to server-side encryption to decrypt the object. For more information, see Server-side Encryption Headers.
This API does not have a request body.
In addition to common response headers, this API also returns the following response headers. For more information on common response headers, see Common Response Headers.
| Name | Description | Type |
|---|---|---|
| Cache-Control | Cache directives as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter | string |
| Content-Disposition | File name as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter | string |
| Content-Encoding | Encoding format as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter | string |
| Content-Range | Byte range of the returned content as defined in RFC 2616, which will be returned only if it is specified in the request | string |
| Expires | Cache expiration time as defined in RFC 2616, which will be returned only if it is contained in the object metadata or if it is specified in the request parameter | string |
| x-cos-meta-* | Contains user-defined metadata and header suffixes | string |
| x-cos-storage-class | Object storage class, such as STANDARD_IA, ARCHIVE and DEEP_ARCHIVE. For the enumerated values, see Storage Class. This header will be returned only if the storage class of the object is not STANDARD. |
Enum |
Versioning-related Headers
If the target object is from a bucket where versioning is enabled, the following response headers will be returned:
| Name | Description | Type |
|---|---|---|
| x-cos-version-id | Object version ID | string |
Server-side Encryption Headers
If server-side encryption is used for the specified object, this API will return the server-side encryption headers. For more information, see Server-side Encryption Headers.
The response body of this API request is the object (file) content.
This API uses standardized error responses and error codes. For more information, see Error Codes .
GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 09:35:16 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586511316;1586518516&q-key-time=1586511316;1586518516&q-header-list=date;host&q-url-param-list=&q-signature=1bd1898e241fb978df336dc68aaef4c0acae****
Connection: closeHTTP/1.1 200 OK
Content-Type: image/jpeg
Content-Length: 16
Connection: close
Accept-Ranges: bytes
Date: Fri, 10 Apr 2020 09:35:16 GMT
ETag: "ee8de918d05640145b18f70f4c3aa602"
Last-Modified: Fri, 10 Apr 2020 09:35:05 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDNkZDRfZDgyNzVkNjRfN2Q5M18xOWVi****
[Object Content]GET /exampleobject?response-content-type=application%2Foctet-stream&response-cache-control=max-age%3D86400&response-content-disposition=attachment%3B%20filename%3Dexample.jpg HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 09:35:17 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586511317;1586518517&q-key-time=1586511317;1586518517&q-header-list=date;host&q-url-param-list=response-cache-control;response-content-disposition;response-content-type&q-signature=4fcea9f80bc67fe475dff746eca0b9abff6a****
Connection: closeHTTP/1.1 200 OK
Content-Type: application/octet-stream
Content-Length: 16
Connection: close
Accept-Ranges: bytes
Cache-Control: max-age=86400
Content-Disposition: attachment; filename=example.jpg
Date: Fri, 10 Apr 2020 09:35:17 GMT
ETag: "ee8de918d05640145b18f70f4c3aa602"
Last-Modified: Fri, 10 Apr 2020 09:35:05 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDNkZDVfNjZjODJhMDlfMTY2MDdfMThm****
[Object Content]GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Wed, 29 Jul 2020 06:51:49 GMT
If-None-Match: "ee8de918d05640145b18f70f4c3aa602"
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1596005509;1596012709&q-key-time=1596005509;1596012709&q-header-list=date;host;if-none-match&q-url-param-list=&q-signature=20e39095b9f22ae1279bec2a3375b527c32d****
Connection: closeHTTP/1.1 304 Not Modified
Content-Type: image/jpeg
Content-Length: 0
Connection: close
Date: Wed, 29 Jul 2020 06:51:49 GMT
ETag: "ee8de918d05640145b18f70f4c3aa602"
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWYyMTFjODVfOGZiNzJhMDlfNDcxZjZfZDY2****GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Wed, 29 Jul 2020 06:51:50 GMT
If-Match: "aa488bb80185a6be87f4a7b936a80752"
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1596005510;1596012710&q-key-time=1596005510;1596012710&q-header-list=date;host;if-match&q-url-param-list=&q-signature=1437a0d094c4e0f8e26909d35b2cca83dcbf****
Connection: closeHTTP/1.1 412 Precondition Failed
Content-Type: application/xml
Content-Length: 480
Connection: close
Date: Wed, 29 Jul 2020 06:51:50 GMT
Server: tencent-cos
x-cos-request-id: NWYyMTFjODZfOGRjOTJhMDlfMmIyMWVfOTJl****
<?xml version='1.0' encoding='utf-8' ?>
<Error>
<Code>PreconditionFailed</Code>
<Message>Precondition not match.</Message>
<Resource>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Resource>
<RequestId>NWYyMTFjODZfOGRjOTJhMDlfMmIyMWVfOTJl****</RequestId>
<TraceId>OGVmYzZiMmQzYjA2OWNhODk0NTRkMTBiOWVmMDAxODc0OWRkZjk0ZDM1NmI1M2E2MTRlY2MzZDhmNmI5MWI1OTdjMDczODYwZjM5YTU3ZmZmOWI5MmY4NjkxY2I3MGNiNjkyOWZiNzUxZjg5MGY2OWU4NmI0YWMwNTlhNTExYWU=</TraceId>
</Error>GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 09:36:00 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586511360;1586518560&q-key-time=1586511360;1586518560&q-header-list=date;host&q-url-param-list=&q-signature=6f9ec1af1aa86abd5b484b41ae1378850ad2****
Connection: closeHTTP/1.1 200 OK
Content-Type: image/jpeg
Content-Length: 16
Connection: close
Accept-Ranges: bytes
Date: Fri, 10 Apr 2020 09:36:00 GMT
ETag: "ee8de918d05640145b18f70f4c3aa602"
Last-Modified: Fri, 10 Apr 2020 09:35:49 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDNlMDBfMzdiMDJhMDlfYTgyNl8xNjA2****
x-cos-server-side-encryption: AES256
[Object Content]GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 09:36:11 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586511371;1586518571&q-key-time=1586511371;1586518571&q-header-list=date;host&q-url-param-list=&q-signature=bdadbe917a50feeb8dddf8c75642be172720****
Connection: closeHTTP/1.1 200 OK
Content-Type: image/jpeg
Content-Length: 16
Connection: close
Accept-Ranges: bytes
Date: Fri, 10 Apr 2020 09:36:11 GMT
ETag: "840af7c921f4b3230049af8663145bd0"
Last-Modified: Fri, 10 Apr 2020 09:36:01 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDNlMGJfZGEyNzVkNjRfZDgxY18xYTBj****
x-cos-server-side-encryption: cos/kms
x-cos-server-side-encryption-cos-kms-key-id: 48ba38aa-26c5-11ea-855c-52540085****
[Object Content]GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 09:36:23 GMT
x-cos-server-side-encryption-customer-algorithm: AES256
x-cos-server-side-encryption-customer-key: MDEyMzQ1Njc4OUFCQ0RFRjAxMjM0NTY3ODlBQkNERUY=
x-cos-server-side-encryption-customer-key-MD5: U5L61r7jcwdNvT7frmUG8g==
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586511383;1586518583&q-key-time=1586511383;1586518583&q-header-list=date;host;x-cos-server-side-encryption-customer-algorithm;x-cos-server-side-encryption-customer-key;x-cos-server-side-encryption-customer-key-md5&q-url-param-list=&q-signature=7da5c304f9439df949b6550ab23aea67a5f0****
Connection: closeHTTP/1.1 200 OK
Content-Type: image/jpeg
Content-Length: 16
Connection: close
Accept-Ranges: bytes
Date: Fri, 10 Apr 2020 09:36:23 GMT
ETag: "582d9105f71525f3c161984bc005efb5"
Last-Modified: Fri, 10 Apr 2020 09:36:12 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDNlMTdfNzBiODJhMDlfZTVmMV8xNDAy****
x-cos-server-side-encryption-customer-algorithm: AES256
x-cos-server-side-encryption-customer-key-MD5: U5L61r7jcwdNvT7frmUG8g==
[Object Content]GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 12:30:02 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586521802;1586529002&q-key-time=1586521802;1586529002&q-header-list=date;host&q-url-param-list=&q-signature=51b3c33f4cfae5d7b31ad61a974db7374f39****
Connection: closeHTTP/1.1 200 OK
Content-Type: image/jpeg
Content-Length: 26
Connection: close
Accept-Ranges: bytes
Date: Fri, 10 Apr 2020 12:30:02 GMT
ETag: "22e024392de860289f0baa7d6cf8a549"
Last-Modified: Fri, 10 Apr 2020 12:29:52 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 11596229263574363878
x-cos-request-id: NWU5MDY2Y2FfMzFiYjBiMDlfMjE2NzVfMTgz****
x-cos-version-id: MTg0NDUxNTc1NTE5MTc1NjM4MDA
[Object Content Version 2]GET /exampleobject?versionId=MTg0NDUxNTc1NjIzMTQ1MDAwODg HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 09:36:45 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586511405;1586518605&q-key-time=1586511405;1586518605&q-header-list=date;host&q-url-param-list=versionid&q-signature=31aeb69334b973ef7406300a182de0645c91****
Connection: closeHTTP/1.1 200 OK
Content-Type: image/jpeg
Content-Length: 16
Connection: close
Accept-Ranges: bytes
Date: Fri, 10 Apr 2020 09:36:45 GMT
ETag: "ee8de918d05640145b18f70f4c3aa602"
Last-Modified: Fri, 10 Apr 2020 09:36:35 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDNlMmRfNzBiODJhMDlfZTYwZl8xM2Fh****
x-cos-version-id: MTg0NDUxNTc1NjIzMTQ1MDAwODg
[Object Content]GET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Fri, 10 Apr 2020 12:32:37 GMT
Range: bytes=8-14
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1586521957;1586529157&q-key-time=1586521957;1586529157&q-header-list=date;host;range&q-url-param-list=&q-signature=719273479357f4b4b4c7d4f5ceb631753101****
Connection: closeHTTP/1.1 206 Partial Content
Content-Type: image/jpeg
Content-Length: 7
Connection: close
Accept-Ranges: bytes
Content-Range: bytes 8-14/16
Date: Fri, 10 Apr 2020 12:32:37 GMT
ETag: "ee8de918d05640145b18f70f4c3aa602"
Last-Modified: Fri, 10 Apr 2020 12:32:25 GMT
Server: tencent-cos
x-cos-hash-crc64ecma: 16749565679157681890
x-cos-request-id: NWU5MDY3NjVfY2VjODJhMDlfOWVlZl8xNmMy****
ContentGET /exampleobject HTTP/1.1
Host: examplebucket-1250000000.cos.ap-beijing.myqcloud.com
Date: Thu, 26 Dec 2019 11:57:24 GMT
Authorization: q-sign-algorithm=sha1&q-ak=AKID8A0fBVtYFrNm02oY1g1JQQF0c3JO****&q-sign-time=1577361444;1577368644&q-key-time=1577361444;1577368644&q-header-list=date;host&q-url-param-list=&q-signature=d975dc7097b2dbffcf2ba001e6dec25dd80a****
Connection: closeHTTP/1.1 403 Forbidden
Content-Type: application/xml
Content-Length: 513
Connection: close
Date: Thu, 26 Dec 2019 11:57:24 GMT
Server: tencent-cos
x-cos-request-id: NWUwNGEwMjRfZDcyNzVkNjRfNjZlM183Zjcx****
x-cos-storage-class: ARCHIVE
<?xml version='1.0' encoding='utf-8' ?>
<Error>
<Code>InvalidObjectState</Code>
<Message>The operation is not valid for the object storage class.</Message>
<Resource>examplebucket-1250000000.cos.ap-beijing.myqcloud.com/exampleobject</Resource>
<RequestId>NWUwNGEwMjRfZDcyNzVkNjRfNjZlM183Zjcx****</RequestId>
<TraceId>OGVmYzZiMmQzYjA2OWNhODk0NTRkMTBiOWVmMDAxODc0OWRkZjk0ZDM1NmI1M2E2MTRlY2MzZDhmNmI5MWI1OTBjNjIyOGVlZmJlNDg4NDQ1MzAzMjA2ZDg4OGQ3MDhlMjIzYjI1ZWUwODY5YjdlMTBjY2EwNTgyZWMyMjc0Mjc=</TraceId>
</Error>
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