ASP.net MVC - Action Does not like JSON string 400 Bad Request

Question

I have an action that takes 2 strings. One of the strings is a big, ugly json string. I suspect that the action will not allow the special characters to be passed because I keep getting a 400 - Bad Request.

Can a serialized json object be passed to an action?

public ActionResult SaveState(string file, string state)
    {
        string filePath = GetDpFilePath(file);
        HtmlDocument htmlDocument = new HtmlDocument();
        htmlDocument.Load(filePath);
        HtmlNode stateScriptNode =
            htmlDocument.DocumentNode.SelectSingleNode("/html/head/script[@id ='applicationState']");
        stateScriptNode.InnerHtml = "var applicationStateJSON =" + state;
        htmlDocument.Save(filePath);

        return null;


    }

ClientScript

  'e' is a large json string  

$.post('/State/SaveState/' + fileName+'/' + '/' + e + '/');

I am now encoding the text using UriEncoding() but it makes no difference. I don't think that MVC Actions allow me to send these special characters by default.. is that true? How do you work around this?

$.post('/State/SaveState/' + encodeURIComponent(fileName) + '/' + '/' + encodeURIComponent(e) + '/');

Sample request:

Request URL:http://localhost:51825/State/SaveState/aa6282.html//%7B%22uid%22%3A%22testUser%22%2C%22a

Michael Dean · Accepted Answer · 2011-05-16 17:08:35Z

2

You need to encode it when the request is made:

$.post('/State/SaveState/' + encodeURIComponent(fileName) + '/' + encodeURIComponent(e));

edited May 16, 2011 at 17:08

answered May 16, 2011 at 3:19

Michael Dean

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2 Comments

Nick Over a year ago

This does not seem to make a differance. I updated my question to reflect my change.

Michael Dean Over a year ago

Oops...extra slashes...I removed them.

BZink · Accepted Answer · 2011-05-16 03:44:51Z

1

Yes, serialized JSON object can be passed to an action method. MVC3 makes this even easier with built-in JSON binding. I use the json2 library to serialize the objects. See this post for more details. Works really great.

http://haacked.com/archive/2010/04/15/sending-json-to-an-asp-net-mvc-action-method-argument.aspx

answered May 16, 2011 at 3:44

BZink

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2 Comments

Nick Over a year ago

Thanks.. This solution requires that I create a DTO object that the JSON can be binded to doesn't it? Since I just want to treat this as a string this seems like an extra step. Is that necessay.

BZink Over a year ago

Yes, you're right it does. Can you give an example of what your JSON string looks like? You may be able to accomplish it without an object server side.

Nick · Accepted Answer · 2011-05-18 02:15:53Z

1

Because I am send this data to the sever and the size of the string I am sending is large. I really should be sending the data in the post body.

It seems that there is also a limitation on the amount of data that you can send via the query string. I cannot be certain that this was the source of the error message but it certainly would make sense. In case the following post works correctly:

 $.post('/State/SaveState/', { file: fileName, state: e });

answered May 18, 2011 at 2:15

Nick

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Comments

Andrew Cooper · Accepted Answer · 2011-05-16 03:18:58Z

0

You probably need to HTML-encode e before you add it to the URL. Also, you have an extra / that you don't need.

answered May 16, 2011 at 3:18

Andrew Cooper

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