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Cloud Object Storage

Configuring CORS Preflight Requests

Terakhir diperbarui:2024-02-04 11:37:31

Overview

This document provides an overview of APIs and SDK code samples related to CORS preflight requests.
API
Operation
Description
Configuring a preflight request for cross-origin access
Sends a preflight request to check whether a real cross-origin access request can be sent

Description

This API (OPTIONS Object) is used to send a preflight request to check the CORS configuration of an object. Before making an actual CORS request, you can send an OPTIONS request that includes the source origin, HTTP method, and headers to COS to determine whether an actual CORS request can be sent. If there is no CORS configuration, "403 Forbidden" will be returned. You can enable CORS for a bucket using the PUT Bucket cors API.

Sample code

cos.optionsObject({
Bucket: 'examplebucket-1250000000', /* Your bucket name. Required. */
Region: 'COS_REGION', /* Bucket region, such as `ap-beijing`. Required. */
Key: '1.jpg', /* Object key stored in the bucket (such as `1.jpg` and `a/b/test.txt`). Required. */
Origin: 'https://www.qq.com', /*Required*/
AccessControlRequestMethod: 'PUT', /*Required*/
AccessControlRequestHeaders: 'origin,accept,content-type' /*Optional*/
}, function(err, data) {
console.log(err || data);
});

Parameter description

Parameter
Description
Type
Required
Bucket
Bucket name in the format of BucketName-APPID
String
Yes
Region
Bucket region. For the enumerated values, please see Regions and Access Endpoints.
String
Yes
Key
Object key (object name), the unique ID of an object in a bucket. For more information, please see Object Overview.
String
Yes
Origin
Origin domain name of the simulated CORS request
String
Yes
AccessControlRequestMethod
HTTP method of the simulated CORS request
String
Yes
AccessControlRequestHeaders
Headers of the simulated CORS request
String
No

Callback function description

function(err, data) { ... }
Parameter
Description
Type
err
Error code, which is returned when an error (network error or service error) occurs. If the request is successful, this parameter is empty. For more information, please see Error Codes.
Object
- statusCode
HTTP status code, such as 200, 403, and 404
Number
- headers
Headers
Object
data
Content returned when the request is successful. If the request fails, this parameter is empty.
Object
- headers
Headers
Object
- statusCode
HTTP status code, such as 200, 403, and 404
Number
- AccessControlAllowOrigin
Source origins (separated by commas) of the simulated CORS request. If the origins are not allowed, this header will not be returned. Example: *
String
- AccessControlAllowMethods
HTTP methods (separated by commas) of the simulated CORS request (for example, PUT,GET,POST,DELETE,HEAD). If the request method is not allowed, this header will not be returned.
String
- AccessControlAllowHeaders
Headers (separated by commas) of the simulated CORS request (for example, accept,content-type,origin,authorization). If none of the stimulated request headers is allowed, this header will not be returned.
String
- AccessControlExposeHeaders
CORS-supported headers (separated by commas) that can be returned, for example, ETag
String
- AccessControlMaxAge
Validity period of the result of the OPTIONS request, for example, 3600
String
- OptionsForbidden
Whether the OPTIONS request is forbidden. If the returned HTTP status code is 403, this value is true.
Boolean


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Configuring CORS Preflight Requests

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