FAQ overview

Error codes

• Fault 203

• 400 errors

• 403 errors

• HTTP status code 404

• HTTP status code 405

• HTTP status code 409

• HTTP status code 411

• HTTP status code 412

• HTTP status code 416

• 424 Error

• 500 errors

• 503 error

Pre-sales FAQ

Before you purchase and use OSS, we recommend that you review the Pre-sales FAQ to learn more about the OSS service.

Billing FAQ

• Why am I still in arrears after I purchase a resource plan?

• How do I deactivate OSS or stop OSS from charging my resources?

• Usage of general-purpose and region-specific resource plans for the Chinese mainland

• How to query bills

• What do I do if the quota of a resource plan is insufficient?

Bucket FAQ

• 'Bucket is not empty' error when deleting an OSS bucket

• Troubleshoot cross-origin resource sharing (CORS) errors in OSS

• CORS

• Why am I unable to access the default homepage when I retrieve an object from a private bucket by using Alibaba Cloud CDN?

• How to hide the OSS Bucket domain name in error messages when CDN origin fetch fails?

Object (file) FAQ

• Using presigned URLs to download or preview files

• How to upload and download directories in OSS

• How do I configure the Content-Type header?

• What batch operations does OSS support?

• How do I upload large objects to OSS?

• Checking OSS MD5 consistency

• How do I restrict file types and size when I upload objects to OSS?

• How Do I Configure HTTPS Requests and SSL Certificates?

• How do I compress objects that I download from OSS in the GZIP format?

• Can I recover an OSS object after it is deleted or overwritten?

• How to configure browser preview behavior for OSS objects?

• Troubleshoot upload callback errors

• How do I play online videos uploaded to OSS?

Data transmission FAQ

• Why is HTTP status code 502 or 504 returned when I use acceleration endpoints to transfer data?

• What do I do if the speed is slow when I upload objects to or download objects from OSS?

• Configure a CDN-accelerated domain name in an OSS SDK

• What do I do if the NeedVerifyDomainOwnership error code is returned when I map a custom domain name to a bucket?

• What do I do if "You are forbidden to list buckets" is returned when I access the accelerated domain name that is mapped to a bucket?

• Troubleshoot certificate errors when accessing OSS over HTTPS

• I often encounter network exceptions when I try to access OSS buckets. How do I fix this?

Tool FAQ

• ossbrowser FAQ

• ossutil FAQ

• ossimport FAQ

• ossfs FAQ

• ossftp FAQ

SDK FAQ

• Java

  • Java SDK FAQ

  • "Connection to XXXX refused" error when using the OSS Java SDK

  • Sample code for timeout and retransmission using OSS Java SDK

  • Sample code for uploading data streams in parts by using OSS SDK for Java

  • A "log4j" error is reported when you use ContentMD5 of the Object Storage Service (OSS) Java SDK

  • The No 'Access-Control-Allow-Origin' error persists after configuring CORS rules

  • Java example: upload objects to OSS with a signed header

• Python

  • Python SDK FAQ

  • Upload a file to Object Storage Service (OSS) with a signed header using Python

  • Error: "No module named oss2" when using Python with OSS

• PHP

  • FAQ (PHP SDK V1)

  • OSS PHP SDK reported "Use of undefined constant CURLOPT_CLOSEPOLICY - assumed" error

  • PHP example for uploading to Object Storage Service (OSS) with a signed header

• Node.js

  • Node.js SDK FAQ

  • Use Node.js to upload an object with a signed header to OSS

• .NET

  • Resolving zero-byte MemoryStream uploads

  • Exception handling (OSS SDK for C# 1.0)

• Browser.js

  Browser.js SDK FAQ

• Go

  • Example of implementing signed header upload using Go for OSS

  • Error handling (Go SDK V1)

• C#

  Example of uploading signature Header in OSS using C# language

• C

  Error handling (C SDK)

• Android

  • Why is the onFailure callback not triggered after a resumable upload fails in the OSS Android SDK?

  • Exception handling (Android SDK)

  • FAQ (Android SDK)

• iOS

  • Resource upload with the iOS SDK appears successful but the resource is not found in the console

  • Exception responses (iOS SDK)

• Ruby

  Handle exceptions (Ruby SDK)

• Other

  • Endpoint error when accessing an OSS bucket using an SDK

  • How do I enable logging by using OSS SDK for iOS and OSS SDK for Android?