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Problem :

I encountered below error while I was trying to export to pdf in the chrome browser.

Duplicate headers received from server
The response from the server contained duplicate headers. This problem is generally the result of a misconfigured website or proxy. Only the website or proxy administrator can fix this issue.
Error 349 (net::ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION): Multiple distinct Content-Disposition headers received. This is disallowed to protect against HTTP response splitting attacks.

How can I fix above error?

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1 Answer

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Solution :

I had also faced the similar issue in the recent past. I did lot of research on it and found the solution on it. This is the very common problem with the people getting started. You need to do a replace on the commas to just remove them and you should be all right. The function to make the valid filename is as below.

public static string MakeTheValidFileName(string myname)
{
string myinvalidChars = Regex.Escape(new    string(System.IO.Path.GetInvalidFileNameChars()));
string myinvalidReStr = string.Format(@"[{0}]+", myinvalidChars);
string myreplace = Regex.Replace(myname, myinvalidReStr, "_").Replace(";", "").Replace(",", "");
return myreplace;
}

OR

You need to just put the pair of double quotes around the file name as shown below:

this.Response.AddHeader("Content-disposition", $"attachment; filename=\"{outputFileName}\"");

Hope the above solutions provided resolve the issue you are currently facing.

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