CURL通过命令行发送超过1024字节的post数据

I am trying to post a large XML file to a web address by using curl in a shell script. I am posting the data using the '-F' option in curl. Whenever I post a file larger than 1024 bytes, the file gets cut off and only sends the first 1024. I've tried changing the "Expect:" header as suggested in another solution for PHP Curl, but it does not work.I am trying to post a large XML file to a web a