How to Solve 'HTTP Error 404.15 - Not Found' Due to Client-Side File Upload Request Length Limits?

Overcoming Request Length Limitations for Client-Side File Creation

When building web applications, it is crucial to ensure that client-side interactions can be accommodated regardless of data size. However, certain configurations may impose limitations on the length of requests, leading to errors such as "HTTP Error 404.15 - Not Found". To overcome this, a key configuration adjustment is often necessary.

Maximal Query String Length Configuration

The HTTP Error 404.15 typically indicates that the request query string, which carries data submitted by the client, exceeds the allowed maximum length. To address this, modify the web.config file to increase the maximum query string length for the application.

Add the following snippet to your web.config:

<system.webServer>
  <security>
    <requestFiltering>
      <requestLimits maxQueryString="32768" />
    </requestFiltering>
  </security>
</system.webServer>

By setting the maxQueryString attribute to an appropriate value (e.g., 32768 in this example), you extend the maximum allowable length for the query string.

Additional Considerations

In some cases, additional configuration changes may be required in the web.config file. Add the following lines if necessary:

<system.web>
    <httpRuntime maxQueryStringLength="32768" maxUrlLength="65536" />
</system.web>

This ensures that both the query string length and the overall URL length are sufficiently extended.

Alternative Client-Side File Generation

If modifying the web.config is not feasible or desirable, alternative approaches exist for generating files on the client side without directly leveraging the filesystem or ActiveX objects. These approaches typically involve using JavaScript and HTML5 features such as the File API and the HTML5 Blob object.

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