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Asked: 2026-06-08T19:04:15+00:00

I’m attempting to inject some text (specifically a few lines of javascript code), into

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I’m attempting to inject some text (specifically a few lines of javascript code), into the HTML response from Nancy after it’s found the view and processed everything. The After hook seems to be where I want to be doing this. I can access the Response object through the context I’m given, but my attempts to retrieve any data from it fails. It is of type Action<Stream> so I’ve been trying to get it written into memory, then a string as follows:

public HelloModule()
{
    After += ctx => {
                var stream = new MemoryStream();
                ctx.Response.Contents.Invoke(stream);

                stream.Position = 0;
                using (var reader = new StreamReader(stream))
                {
                    var content = reader.ReadToEnd();
                }
    };

    Get["/"] = p => View["Issues/Views/SingleIssue"];            
}

But, when this runs I get an exception on the line ctx.Response.Contents(stream);. The exception is an InvalidOperationException which only states that "CSRF is not enabled on this request".

So, my question is: How do I get Nancy to allow me access to the HTML of the current Response its produced? Or am I completely off with how I’m trying to do this? Is there a better way?

Edit 2: This appears to be an issue with the SuperSimpleViewEngine. I just created a new, clean project with a single view. SSVE can reproduce it, but the spark view engine will work just fine.

Edit 1:

As requested some more information. The code above now contains the entire constructor for the module. I have no custom bootstrapper or other logic in the way. The view is a rather simple view using the default SuperSimpleViewEngine, it’s composed exactly as follows:

Master.sshtml

<html>
<head>
    <script type="text/javascript" src="/Scripts/jquery-1.7.2.min.js"></script>
    <script type="text/javascript" src="/Scripts/jquery-ui-1.8.22.min.js"></script>
    <script type="text/javascript" src="/Scripts/jquery-ui-1.8.21.custom.min.js"></script>
    <script type="text/javascript" src="/Scripts/dais-exts.js"></script>
    <link rel="stylesheet" type="text/css" href="/Content/Style.css" />
    <link rel="stylesheet" type="text/css" href="/Content/jquery-ui-1.8.21.custom.css" />
    @Section['Head']
</head>
<body>
    @Section['Content']
</body>
</html>

SingleIssue.sshtml

@Section['Head']
    <title>Hello!</title>
@EndSection

@Section['Content']
    <h2>View/Edit Issue</h2>

    <form id="issue-form" method="post">
        <input type="hidden" name="HttpMethod" value="Put" />
        <input type="submit" />
    </form>
@EndSection
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1 Answer

  1. Editorial Team

    Answering the question, just so anyone finding this knows what’s going on.

    This is actually a bug in Nancy (version 0.11) and only occurs when using the SuperSimpleViewEngine. Unfortunately there’s no easy workarounds or solutions, but a fix has been applied to the source. So, the options to resolve the issue are:

    • Wait for Nancy 0.12.
    • Build a new version yourself from source.
    • Use a different view engine.
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