C# HttpClient 模拟上传图片返回413

250292962 2018-01-01 10:45:51

通过抓包发现网页是先获取两个token，然后用flash控件选取图片然后上传到服务器，然后返回图片Id
抓到包之后把这个包原封不动的POST回去会返回413 主体过大，但是如果在请求中把content-length删掉倒是可以返回200，但是没有返回图片Id，并且图片上传成功了。
这是请求头和响应头

这是内容
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="Filename"

DSC01383.JPG
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="uploadTokenType"

2
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="fileType"

0
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="title"

DSC01383.JPG
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="userTokenType"

1
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="campaignId"

16
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="userId"

YIOMOOOO
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="uploadToken"

Y97STX7RP6OG1512481364459
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="userToken"

Z0LXLLGBVRGE1512481364446
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="imagefile"; filename="DSC01383.JPG"
Content-Type: application/octet-stream
（此处是图片的stream）
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4
Content-Disposition: form-data; name="Upload"

Submit Query
------------ei4Ij5KM7ei4Ef1KM7ei4KM7Ij5ei4--

以下是我自己尝试模拟的请求。



            HttpClient httpClient = new HttpClient(Sign.HttpClientHandler);

            httpClient.DefaultRequestHeaders.Accept.ParseAdd("text/*");

            httpClient.DefaultRequestHeaders.UserAgent.TryParseAdd("Shockwave Flash");



            var content = new MultipartFormDataContent();

            var contentByteContent = new ByteArrayContent(uploadImageInfo.ContentByte);



            var uzrTokenContent = new StringContent(uzrtoken);

            var uploadTokenContent = new StringContent(uploadtoken);



            {

                content.Add(new StringContent(uploadImageInfo.Name), "Filename");

                content.Add(new StringContent("2"), "uploadTokenType");

                content.Add(new StringContent("0"), "fileType");

                content.Add(new StringContent(uploadImageInfo.Name), "title");

                content.Add(new StringContent("1"), "userTokenType");

                content.Add("16", "campaignId");

                content.Add(new StringContent(userId), "userId");

                content.Add(uploadTokenContent, "uploadToken");

                content.Add(uzrTokenContent, "userToken");

                contentByteContent.Headers.TryAddWithoutValidation("Content-Type", "application/octet-stream");

                content.Add(contentByteContent, "imagefile");

                content.Add(new StringContent("Submit Query"), "Upload");

            }