When you try to upload a file, the size of the AJAX request ends up significantly larger than the file's original

Currently, I have a basic file upload feature set up using knockout within my durandal website. The process involves converting the file to a base64StringArray and then uploading it to the server using an AJAX post method like this:

$.post("localhost/uploadDocument", dataToPost)

In my application, I have implemented request filtering with the following configurations:

<requestLimits maxAllowedContentLength="31457280" />

along with

<httpRuntime targetFramework="4.5.2" maxRequestLength="30720" />

This setup enforces a 30mb file size limit.

The issue arises when trying to upload a specific Microsoft Excel file that contains embedded PDF files. This particular file has a size of 14,887,424 bytes, but upon upload, Fiddler reports that 49,158,346 bytes were actually transmitted, resulting in a 404.13 error - indicating that the request content length has been exceeded.

I am puzzled as to why such a large number of bytes are being sent for this Excel file with embedded PDFs.

javascriptajaxbase64

Answer №1

To reduce the size of the string on the client side, I recommend utilizing LZW compression as demonstrated in this example:

After compressing the data on the client side, you can then decompress it on the server side and perform any necessary validation procedures, such as checking the file size.

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