将二进制数据传输到HTTP REST API服务的好方法是什么？

We are extending our HTTP REST API to allow clients to upload picture (for the purpose of this question, assuming binary data). So far we have only allowed simply strings in our API parameters. What is a good way to allow them to upload binary data? Would it be to request for the base64 encoded form? Would the URL become too long for the web server to handle?We are extending our HTTP REST API to allow cli