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Web Client Problem: Waiting Failed?

I have a custom Http handler that controls HTTP POST and GET. I got a project running on a separate isolated server, now I need to put it into production ...

using (var client = new WebClient())
                {
                    client.Credentials = CredentialCache.DefaultCredentials;
                    client.UploadFile("serverlocation:port", fileToUpload);
                }

For some reason now that it’s being used client.UploadFile("", file);, that is, forcing HTTP POST

System.Net.WebException: The remote server returned an error: (417) Expectation failed.

   at System.Net.WebClient.UploadFile(Uri address, String method, String fileName)

What could it be? I know the code works, so what else? Maybe the server is blocking HTTP POST requests?

I tried to add:

ServicePointManager.Expect100Continue = false;

But I did not succeed, although I am not 100% sure where this code should be before, I assume that before I use WebClient

Change 0:

I have read the following:

-   , ": 100-  ", 417 ( )   100 (). ,   (, ),   100 () ,   .

, -, - .

1:

, 100-, , , , WebClient.UploadFile, :

POST http://XXX.XXX.XXX.XXX:8091/file.myhandledextension HTTP/1.1
Content-Type: multipart/form-data; boundary=---------------------8ccd1eb03f78bc2
Host: XXX.XXX.XXX.XXX:8091
Content-Length: 4492
Expect: 100-continue

, , , : ServicePointManager.Expect100Continue = false;. , .

+3
1

, ServicePointManager.Expect100Continue = false; WebClient.

Fiddler, POST, Expect: 100-continue .

+3

Source: https://habr.com/ru/post/1748444/

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