Скачать или смотреть Resolving XMLHttpRequest File Upload Issues on Mobile Devices

Discover why your `XMLHttpRequest` file uploads work on web browsers but fail on mobile devices, and learn how to fix the issue effectively.
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This video is based on the question https://stackoverflow.com/q/69103334/ asked by the user 'Shahrukh' ( https://stackoverflow.com/u/1790589/ ) and on the answer https://stackoverflow.com/a/69175870/ provided by the user 'Shahrukh' ( https://stackoverflow.com/u/1790589/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting XMLHttpRequest File Upload Issues on Mobile

When developing web applications that allow users to upload files, you might encounter issues that only appear on mobile devices. Recently, a developer reported that while their XMLHttpRequest file uploads function perfectly on desktop browsers, a similar implementation fails on mobile devices. This post will delve into the potential causes of such issues and provide practical solutions to get your file uploads working seamlessly across all platforms.

The Problem at Hand

The developer in question was utilizing an XMLHttpRequest method to upload images from a web form. The code was functioning well on browsers like Chrome or Firefox on desktops, but mobile users experienced upload failures. The situation became even more concerning after a system upgrade by the hosting provider, which prompted the need for immediate resolution.

Symptoms of the Issue

File uploads successfully show progress on desktop browsers.

No specific errors appear in the log files.

The upload process is initiated but fails during execution on mobile devices.

Understanding the Solution

Upon researching the issue, the developer added several configurations to their users.ini file, which ultimately resolved the upload problem. These configurations boost the server's capacity to handle file uploads efficiently. Here are the configurations they implemented:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of Each Configuration

memory_limit = 128M:

This setting increases the amount of memory that a script can consume. Since file uploads can be memory-intensive (especially large files), ensuring sufficient memory is critical.

max_input_vars = 2000:

This defines the maximum number of input variables (form fields) that PHP will accept. If you have complex forms with many fields, a higher limit prevents truncation of input data.

upload_max_filesize = 64M:

This sets the maximum size of file uploads. For mobile devices, it's possible users might be attempting to upload larger files, so a generous limit can prevent issues.

post_max_size = 64M:

Related to upload_max_filesize, this defines the maximum size of the entire body of the request for file uploads. It needs to be larger than upload_max_filesize.

max_execution_time = 120:

This parameter specifies the maximum time a script is allowed to run. Increasing this value ensures that larger files have enough time to upload, particularly when network conditions might slow the process.

Final Thoughts

After making these adjustments, the developer reported that the issue had been successfully resolved and file uploads were once again functioning on mobile devices. When working with file uploads in web applications, particularly via AJAX and XMLHttpRequest, keep such server configurations in mind. They can significantly impact the performance and reliability of your upload features.

In conclusion, ensure your server is properly configured to handle file uploads effectively, particularly when users access your application from various devices. Regularly revisiting and assessing server settings is a best practice to maintain a smooth user experience.

If you’re experiencing file upload problems similar to the one discussed, it may be time to check your server configurations. Happy coding!