http header expect:100-continue

[aartjan]

I am trying to make a HTTP PUT request to a webservice, which I can't get to work because it keeps returning the following error in its header: HTTP/1.1 417 Expectation Failed

In the body it explains that I have a header "expect:100-continue" in my PUT request header (see image). 

I have tried everything to remove that particular header from my request (using LabviewHTTPclient.lvlib:removeheader.vi), but Labview still sends it.

2 questions:

- Is there a tool that lets me see what header/request labview actually sends to the webservice?

- how come I can't remove that header?

Thanks for your input!

BTW. I got it working in Curl, which I believe is used by Labview itself as well

[ThiCop]

Hello Aartjan,

About the tool:

You could use wireshark (just an example).

About the header part:

Can you share your code or a simplification of it (Project and files [vi's..]) that allows me to test/reproduce/see what's going on?

To know what causes the issue we need to see your code.