I\'m trying to create a utility to download file from the internet and upload it again to Azure blob storage. Blob containers already created well; But for some reason i\'m get
Have you tried creating a container manually on azure portal? It has some limitations on what name you can give containers.
For example: Container name cannot contain upper case letters.
If you request a container with an invalid name, it will result in (400) Bad Request, which you are getting. So check your "containerName" string.