# OPTIONS Object

#### Functions

For details, see OPTIONS Bucket.

#### Differences Between OPTIONS Bucket and OPTIONS Object

With the OPTIONS Object, you need to specify an object name in the URL, but an object name is not required with the OPTIONS Bucket, which uses the bucket domain name as the URL. The request lines of the two methods are as follows:

    OPTIONS /object HTTP/1.1

    OPTIONS / HTTP/1.1

#### Request Syntax

    1
    2
    3
    4
    5
    6

    OPTIONS /object HTTP/1.1
    Host: bucketname.obs.region.example.com
    Date: date
    Authorization: authorization
    Origin: origin
    Access-Control-Request-Method: method

#### Request Parameters

This request contains no parameter.

#### Request Headers

Table 1 describes headers used by this request.

Table 1 OPTIONS request headers
Header | Description | Mandatory
--- | --- | ---
Origin | Origin of the cross-domain request specified by the pre-request. Generally, it is a domain name set in CORS. Type: string | Yes
Access-Control-Request-Method | Indicates an HTTP method that can be used by a request. The request can use multiple method headers. Type: string Valid values: GET, PUT, HEAD, POST, and DELETE. | Yes
Access-Control-Request-Headers | Indicates the HTTP headers of a request. The request can use multiple HTTP headers. Type: string | No

#### Request Elements

This request involves no elements.

#### Response Syntax

    1
    2
    3
    4
    5
    6
    7
    8
    9

    HTTP/1.1 status_code
    Content-Type: type
    Access-Control-Allow-Origin: origin
    Access-Control-Allow-Methods: method
    Access-Control-Allow-Header: header
    Access-Control-Max-Age: time
    Access-Control-Expose-Headers: header
    Date: date
    Content-Length: length

#### Response Headers

The request uses the headers described in Table 2.

Table 2 CORS request headers
Header | Description
--- | ---
Access-Control-Allow-Origin | If the origin of a request meets server CORS configuration requirements, the response contains the origin. Type: string
Access-Control-Allow-Headers | If the headers of a request meet server CORS configuration requirements, the response contains the headers. Type: string
Access-Control-Max-Age | Value of MaxAgeSeconds in the CORS configuration of a server. Type: integer
Access-Control-Allow-Methods | If the Access-Control-Request-Method of a request meets server CORS configuration requirements, the response contains the methods in the rule. Type: string Possible values are GET, PUT, HEAD, POST, and DELETE.
Access-Control-Expose-Headers | Indicates ExposeHeader in the CORS configuration of a server. Type: string

#### Response Elements

This response involves no elements.

#### Error Responses

Table 3 describes possible special errors in the request.

Table 3 Special error
Error Code | Description | HTTP Status Code
--- | --- | ---
Bad Request | Invalid Access-Control-Request-Method: null When CORS and OPTIONS are configured for a bucket, no method header is added. | 400 BadRequest
Bad Request | Insufficient information. Origin request header needed. When CORS and OPTIONS are configured for a bucket, no origin header is added. | 400 BadRequest
AccessForbidden | CORSResponse: This CORS request is not allowed. This is usually because the evaluation of Origin, request method/Access-Control-Request-Method or Access-Control-Request-Headers are not whitelisted by the resource's CORS spec. When CORS and OPTIONS are configured for a bucket, origin, method, and headers do not match any rule. | 403 Forbidden

For other errors, see Table 2.

#### Sample Request

    1
    2
    3
    4
    5
    6
    7
    8

    OPTIONS /object_1 HTTP/1.1
    User-Agent: curl/7.29.0
    Host: examplebucket.obs.region.example.com
    Accept: */*
    Date: WED, 01 Jul 2015 04:02:19 GMT
    Authorization: OBS H4IPJX0TQTHTHEBQQCEC:bQZG9c2aokAJsHOOkuVBK6cHZZQ=
    Origin: www.example.com
    Access-Control-Request-Method: PUT

#### Sample Response

     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11

    HTTP/1.1 200 OK
    Server: OBS
    x-obs-request-id: BF26000001643632D12EFCE1C1294555
    Access-Control-Allow-Origin: www.example.com
    Access-Control-Allow-Methods: POST,GET,HEAD,PUT,DELETE
    Access-Control-Max-Age: 100
    Access-Control-Expose-Headers: ExposeHeader_1,ExposeHeader_2
    Access-Control-Allow-Credentials: true
    x-obs-id-2: 32AAAQAAEAABAAAQAAEAABAAAQAAEAABCS+DXV4zZetbTqFehhEcuXywTa/mi3T3
    Date: WED, 01 Jul 2015 04:02:19 GMT
    Content-Length: 0

Parent topic: Static Website Hosting