Fuseki SPARQL 1.1 Protocol "UPDATE using POST directly" fails with 400

Steps to Reproduce:

• Start Fuseki jar
• Create test dataset
• run

  ./soh update --service=http://localhost:3030/test/ "INSERT DATA { <http://foo> <http://bar> <http://baz>. }"
  

Expected:
Triple inserted

Actual:

400 Unknown content type for triples: [application/sparql-update] http://localhost:3030/test/

This is basically the example from http://www.w3.org/TR/2013/REC-sparql11-protocol-20130321/#update-direct-simple