Posting a large content with curl

When you use curl to post a large content, sometimes a server may return 417 response. This is because curl add Expect: 100-continue to a request if it is large enough, and some servers don’t support 100 continue response.

To avoid this problem, you can add Expect header explicitly. For example:

curl -H 'Expect:' --data-binary '@test.dat' 'http://example.com/foo'

will make curl not send Expect header.