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To design an API for efficiently uploading large dataset files from mobile devices to a PC server, the following features are essential based on industry best practices and technical requirements:

Core Features

1. Resumable Uploads

  • Allow uploads to pause and resume automatically after network interruptions, avoiding restarts. Critical for mobile environments with unstable connections[1][4].
  • Implement session tracking (e.g., unique upload IDs) to manage interrupted transfers[1][7].

2. Chunked File Transfer

  • Split large files into smaller chunks (e.g., 100 MB each) to:
  • Reduce memory strain on servers and clients[1][2].
  • Enable retries of failed chunks without resending the entire file[5].
  • Use multipart/form-data encoding for efficient chunk assembly[2][5].

3. Streaming Support

  • Process files as they are uploaded (client-to-server streaming) to avoid buffering entire datasets in memory[1][2].
  • Example: Use Node.js createReadStream or .NET Request.Body streaming[1][2].

4. Cloud Storage Integration

  • Directly upload files to cloud storage (e.g., AWS S3, Azure Blob) via pre-signed URLs to offload server processing[5][8].
  • Reduce API latency by separating file uploads from metadata handling[3][8].

5. CDN and Geographic Optimization

  • Route uploads to the nearest CDN edge location (e.g., AWS Transfer Acceleration) to minimize latency[1][4].
  • Ensure global users experience consistent speeds[1][4].

Performance and Reliability

6. Error Handling and Logging

  • Implement robust error logging to diagnose failures (e.g., network timeouts, corrupted chunks)[2][5].
  • Validate checksums (e.g., MD5, SHA-256) for data integrity[1][5].

7. Rate Limiting and Throttling

  • Prevent server overload by limiting concurrent uploads or bandwidth per client[2][5].
  • Use asynchronous processing for heavy workloads (e.g., Hangfire)[2].

8. Timeout Management

  • Adjust server and client timeouts to accommodate large transfers[2][5].
  • Use keep-alive signals to maintain active sessions[7].

Security

9. Secure Transfers

  • Enforce HTTPS for encrypted data transmission[1][4].
  • Use token-based authentication (e.g., OAuth 2.0) to control access[4][8].

10. Access Controls

  • Restrict upload permissions via roles (e.g., admin, user)[1][4].
  • Validate file types and sizes to prevent malicious uploads[8].

User Experience

11. Progress Tracking

  • Provide real-time upload progress (e.g., percentage completed) to users[4][5].
  • Send email/SMS notifications on success or failure[4].

12. Client-Side SDKs

  • Offer mobile SDKs (iOS/Android) to simplify integration:
  • Automatic chunking and retries[1][4].
  • Network optimization (e.g., Wi-Fi vs. cellular)[5].

13. Compression

  • Enable optional on-device compression (e.g., ZIP) to reduce transfer sizes[5].

Scalability

14. Load Balancing

  • Distribute upload requests across multiple servers to handle high traffic[1][8].
  • Use auto-scaling to adjust capacity dynamically[4].

15. Metadata Support

  • Attach custom metadata (e.g., timestamps, device info) to files during upload[8].

By combining these features, the API will ensure fast, reliable, and secure large file transfers from mobile devices, even in low-bandwidth environments. Solutions like Uploadcare[1] or TransferNow[4] provide prebuilt infrastructure, while custom implementations can leverage AWS S3, resumable protocols[7], and client SDKs for optimal performance.

Citations: [1] https://uploadcare.com/blog/handling-large-file-uploads/ [2] https://learn.microsoft.com/en-us/answers/questions/1375143/strategies-for-handling-large-file-uploads-in-a-ne [3] https://intelligentpathways.com.au/enabling-large-file-transfer-with-apis/ [4] https://developers.transfernow.net [5] https://www.reddit.com/r/softwarearchitecture/comments/10v7mo2/how_to_upload_large_files_1gb_through_a_restapi/ [6] https://stackoverflow.com/questions/2276851/large-data-transfer-between-mobile-app-and-a-server/2276888 [7] https://developers.google.com/android-publisher/upload [8] https://terem.tech/api-file-upload-best-practice/ [9] https://blog.xapihub.io/2023/12/22/Handling-File-Uploads-in-RESTful-APIs.html [10] https://apidog.com/blog/file-upload-in-apis/ [11] https://stackoverflow.com/questions/33889410/proper-way-to-implement-restful-large-file-upload [12] https://stackoverflow.com/questions/26535866/best-approach-to-send-big-files-to-a-server-in-a-automatic-way-using-a-rest-api [13] https://stackoverflow.com/questions/3351742/upload-large-files-on-the-web-server-on-android [14] https://softwareengineering.stackexchange.com/questions/272035/best-practice-for-uploading-large-file-previewing-and-editing-before-saving-to [15] https://blog.stoplight.io/best-practices-for-designing-apis-for-mobile-apps [16] https://www.dropboxforum.com/discussions/101000042/an-actually-useful-guide-on-uploading-large-files-via-api/555797 [17] https://terem.tech/large-files-apis-lessons-learnt/ [18] https://developers.google.com/drive/api/guides/manage-uploads [19] https://community.openai.com/t/uploading-large-files/14857 [20] https://github.com/immich-app/immich/discussions/1674

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