Help Center> Object Storage Service> BrowserJS> Object Download> Rewriting Response Headers
Updated on 2023-11-09 GMT+08:00
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Rewriting Response Headers

If you have any questions during development, post them on the Issues page of GitHub. For details about parameters and usage of each API, see the API Reference.

When downloading an object, you can rewrite some HTTP/HTTPS response headers. The following table lists rewritable response headers.

Parameter

Description

ResponseContentType

Rewrites Content-Type in HTTP/HTTPS responses.

ResponseContentLanguage

Rewrites Content-Language in HTTP/HTTPS responses.

ResponseExpires

Rewrites Expires in HTTP/HTTPS responses.

ResponseCacheControl

Rewrites Cache-Control in HTTP/HTTPS responses.

ResponseContentDisposition

Rewrites Content-Disposition in HTTP/HTTPS responses.

NOTICE:

If you set SaveByType to file, rewriting Content-Disposition is not allowed. You need to use a temporary URL to download the file and rewrite Content-Disposition.

ResponseContentEncoding

Rewrites Content-Encoding in HTTP/HTTPS responses.
Sample code: 
// Create an instance of ObsClient.
var obsClient = new ObsClient({
    // Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
    // The front-end code does not have the process environment variable, so you need to use a module bundler like webpack to define the process variable.
    // Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
    access_key_id: process.env.AccessKeyID,
    secret_access_key: process.env.SecretAccessKey,
    //CN-Hong Kong region is used here as an example. Replace it with the one in your actual situation.
    server: 'https://obs.ap-southeast-1.myhuaweicloud.com'
    
});

obsClient.getObject({
       Bucket : 'bucketname',
       Key : 'objectname',
       ResponseContentType : 'image/jpeg'
}, function (err, result) {
       if(err){
              console.error('Error-->' + err);
       }else{
              console.log('Status-->' + result.CommonMsg.Status);
              if(result.CommonMsg.Status < 300 && result.InterfaceResult){
                  // Obtain the rewritten response headers.
                  console.log(result.InterfaceResult.ContentType);
              }
       }
});
Parent topic: Object Download