curl - Error 411 when using POST request in WSO2 API Manager

Question

I have created an API via the WSO2 API Manager curl GET requets work fine as you can see below:

But when trying to setup a POST request I get the following message "error 411: Length required"

I have tried different things such as disabling chunking or forcing content length header (as WSO2 removes that header by default) by changing the sequence file as shown below but to no avail:

And what is strange is that I use command prompt to make the same post request it works even I do not specify the content-length header which suggest that it is added automatically (correct me if I am wrong):

There must be something I am doing wrong could you please help me out?

Thanks in advance.

Regards,

question from:https://stackoverflow.com/questions/65849907/error-411-when-using-post-request-in-wso2-api-manager