Vue Element uploads large files online errors: How to troubleshoot cross-domain problems and other potential causes?

Vue Element UI el-upload component online large file upload error analysis and solution

This article discusses the common problems in the file upload scenarios that combine the el-upload component of Vue, Element UI and the ThinkPHP backend. Local tests are normal, but large files are uploaded in the online environment fail (small files are normal). The problem is manifested as: local (both front and back ends are both local, using Nginx) test size files are uploaded normally, but in an online environment, a large file upload of 40-50MB reported an error, prompting a cross-domain error. It has been confirmed that the Nginx maximum upload limit (512MB), PHP maximum upload and POST upload limit (200MB) are all sufficient.

Primary investigation direction: debug mode

The main difference between local and online environments may be the enabled state of debug mode. Additional request or response header information generated in debug mode may conflict with Nginx or other middleware in the online environment, especially in large file upload scenarios, such conflicts are more likely to be amplified and lead to cross-domain errors. It is recommended to turn off debug mode first and retest large file uploads.

Other potential problems and solutions:

If the problem remains after turning off debug mode, you need to further troubleshoot the following aspects:

• Nginx configuration: Check the online Nginx configuration again carefully, especially client_max_body_size and other parameters to ensure that it is set correctly and can effectively handle large file upload requests.
• ThinkPHP backend code: Check the file upload logic of ThinkPHP backend code to ensure that it can handle large file uploads correctly and eliminate potential errors in the code.
• Cross-domain configuration: Carefully verify the cross-domain configuration of the front and back ends and confirm that the domain name or IP address that is allowed to upload large files to request.
• Server resources: Check the server resource usage (memory, CPU, etc.) to ensure that the server has enough resources to handle large file uploads.

Through the above steps, systematically checking the problem, I believe that it can effectively solve the problem of online uploading and reporting errors in Vue Element large files.

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