Previously, some MockMvc-specific logic would add a Content-Length
header to every request that had content. This led to the curl request
snippet containing a -H option for the Content-Length header. This is
unnecessary as curl will automatically generate a Content-Length
header based on the data that's being sent to the server. A secondary
problem was the inconsistent automatic addition of a Content-Length
header; the header was not automatically added to responses.
This commit remove the MockMvc-specific logic in favour of some new
logic in the core project to automatically add a Content-Length header
to both requests and responses. The curl request snippet has been
updated to supress the header in favour of curl's automatic
generation.
Closes gh-111
5da4bee3c6