Question

During some testing I discovered that on an Apache server form POST arrays needed to be different than those on an IIS server. Eg.

Apache:

<form method="post">
    <input type="hidden" name="a[]" value="asd" />
    <input type="hidden" name="a[]" value="cvbcv" />
    <input type="submit" name="b" value="Submit" />
</form>

IIS using MVC3 Framework:

<form method="post">
    <input type="hidden" name="a" value="asd" />
    <input type="hidden" name="a" value="cvbcv" />
    <input type="submit" name="b" value="Submit" />
</form>

Both give the same result with an array called a of length 2.
At what point during the stack is this evaluated? Webserver, browser, etc.

Note: Using the opposite notation on each server fails to produce the array.

Answer 1

This could be a browser issue. I just tried this code in IE 9 and Chrome.

<form action="@Url.Action("Index", "Default")" method="post">
 <input type="hidden" name="vals[]" value="1"/>
 <input type="hidden" name="vals[]" value="2"/>
 <input type="submit" name="button" value="Go" />
</form>

And the controller

    [HttpPost]
    public ActionResult Index(string button, string[] vals)
    {
        return null;
    }

In Chrome, vals was an array of length 1, with the only value being 1

In IE9, vals was null