Can you tell if the file is duplicated before uploading it to the server?

Can you tell if the file is duplicated before uploading it to the server?

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Can you tell if the file is duplicated before uploading it to the server?

If you are uploading in a browser, you need to use JavaScript to get the local file MD5 value, you can refer to this stackoverflow answer.
If you are a normal client, then it is better to do, in short, to get the local file MD5.

Then, on the server, save a list of all the MD5 files that have been uploaded for completion. Before the user uploads a file, the MD5 of the local file is sent to the server, the server is found in the MD5 of the saved file, and if it is found, it is already there.

The client is not fully judgmental.

