Invalid URI: The Uri string is too long using Imgur API

Question

I am using imgur API to upload images but i am getting an exception on this line:

string uploadRequestString = "image=" + Uri.EscapeDataString(Convert.ToBase64String(imageData)) + "&key=" + apiKey;

Invalid URI: The Uri string is too long.

Full code:

public static string PostToImgur(string imagFilePath, string apiKey)
{
    byte[] imageData;
    FileStream fileStream = File.OpenRead(imagFilePath);
    imageData = new byte[fileStream.Length];
    fileStream.Read(imageData, 0, imageData.Length);
    fileStream.Close();

    string uploadRequestString = "image=" + Uri.EscapeDataString(Convert.ToBase64String(imageData)) + "&key=" + apiKey;

    HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("http://api.imgur.com/2/upload");
    webRequest.Method = "POST";
    webRequest.ContentType = "application/x-www-form-urlencoded";
    webRequest.ServicePoint.Expect100Continue = false;

    StreamWriter streamWriter = new StreamWriter(webRequest.GetRequestStream());
    streamWriter.Write(uploadRequestString);
    streamWriter.Close();

    WebResponse response = webRequest.GetResponse();
    Stream responseStream = response.GetResponseStream();
    StreamReader responseReader = new StreamReader(responseStream);

    string responseString = responseReader.ReadToEnd();

    XmlDocument doc = new XmlDocument();
    doc.InnerXml = responseString;
    XmlElement root = doc.DocumentElement;
    responseString = root.GetElementsByTagName("original")[0].InnerText;

    return responseString;
}

It works for smaller size file but getting that error on large files.

score 2 · Accepted Answer · answered Feb 13 '12 at 09:24

2

I suspect that the output from System.Convert.ToBase64String(imageData) is too long to be a valid URI which is around 2000 characters (I think it's 2048).

This will be related to the size of the image as a smaller image can be encoded into a shorter string.

You aren't going to be able to get round this limit.

answered Feb 13 '12 at 09:24

ChrisF

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Thanks for your reply sir, If i upload a 20Kb it works but i tried on 500Kb sized image and i see that error. – user969068 Feb 13 '12 at 09:26

score 2 · Answer 2 · edited May 23 '17 at 12:11

Use a shorter URL. The URLL per specification is limited and uploading binary data WILL blow this length.

Noone does it - normally data is attached as a form request variables, no part of the URL.

"image=" + Uri.EscapeDataString(System.Convert.ToBase64String(imageData))

WILL NOT WORK. You can not have multi megaby URL's.

What is the maximum length of a URL in different browsers?

has a discussion. Conclusion is that about 2000 characters is maximum length.

Anyhow, put the image into a variable that is part of the request payload, not the url.

score 0 · Answer 3 · answered Mar 15 '13 at 13:42

Easy with http://restsharp.org/

FileStream fileStream = File.OpenRead(imagFilePath);
imageData = new byte[fileStream.Length];
fileStream.Read(imageData, 0, imageData.Length);
fileStream.Close();

RestClient client = new RestClient("https://api.imgur.com/3/image");
        RestRequest request = new RestRequest()
        {
            Method = Method.POST,
        };
request.AddHeader("Authorization", "YOUR Client-ID");
request.AddParameter("image", Convert.ToBase64String(imageData), ParameterType.RequestBody);
IRestResponse restResponse = client.Execute(request);

score 0 · Answer 4 · answered Feb 13 '12 at 09:25

0

You can use a PUT request if possible.

answered Feb 13 '12 at 09:25

STM

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Invalid URI: The Uri string is too long using Imgur API

4 Answers4