Stop IIS 7.5 From Sending Out Cache-Control Max-Age on Error Codes

Solution 1:

I created a rudimentary test "suite".

When I run the tests with a minimal Web.config on IIS 7.0 (Integrated pipline mode on .NET 4.0) everything passes; the test file's Cache-Control response header is set to private when it's request's Accept header doesn't match the file's Content-Type.

This leads me to believe that you have some module interrupting IIS's static caching routine or IIS 7.0 and 7.5 differ here.

Here are the files I used (sans some-script.js since its just an empty file):

Web.Config:

<?xml version="1.0"?>
<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0">
        </compilation>
    </system.web>
    <system.webServer>
        <staticContent>
            <!-- Set expire headers to 30 days for static content-->
            <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="7.00:00:00" />
        </staticContent>
    </system.webServer>
</configuration>

test.html:

<!doctype html>
<html>
<head>
    <title>http://serverfault.com/questions/346975</title>
    <style>
        body > div
        {
            border:1px solid;
            padding:10px;
            margin:10px;
        }
    </style>
</head>
    <body>
        <div>
            <h2>Request JS file with Accepts: accept/nothing</h2>
            <b>Response Headers: </b>
            <pre id="responseHeaders-1">loading&hellip</pre>
        </div>

        <div>
            <h2>Request JS file with Accepts: */*</h2>
            <b>Response Headers: </b>
            <pre id="responseHeaders-2">loading&hellip</pre>
        </div>

        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
        <script>
            var responseHeaders1 = $("#responseHeaders-1"),
                responseHeaders2 = $("#responseHeaders-2"),
                fetchScript = function (accepts, element, successMsg, errorMsg) {

                    var jXhr = $.ajax({
                        // fetch the resource "fresh" each time since we are testing the Cache-Control header and not caching itself
                        "url": "some-script.js?" + (new Date).getTime(),
                        "headers": {
                            "Accept" : accepts
                        },
                        "complete": function () {
                            var headers = jXhr.getAllResponseHeaders();
                            headers = headers.replace(/(Cache-Control:.+)/i, "<strong><u>$1</u></strong>");
                            element.html(headers);
                        },
                        "success": function () {
                            element.after("<div>" + successMsg + "</div>");
                        },
                        "error": function () {
                            element.after("<div>" + errorMsg + "</div>");
                        }
                    });
                };

                fetchScript("accept/nothing", responseHeaders1, "Uh, your server is sending stuff when the client doesn't accept it.", "Your server (probably) responded correctly.");
                fetchScript("*/*", responseHeaders2, "Your server responded correctly.", "Something went wrong.");
        </script>
    </body>
</html>

Stop IIS 7.5 From Sending Out Cache-Control Max-Age on Error Codes

Solution 1:

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