How to send data to server for Prediction - MLflow

your hostname/URI is misplaced in the request

curl -X POST http://127.0.0.1:1234/invocations -H "Content-Type:application/json; format=pandas-split" --data '{"columns":["alcohol", "chlorides", "citric acid", "density", "fixed acidity", "free sulfur dioxide", "pH", "residual sugar", "sulphates", "total sulfur dioxide", "volatile acidity"],"data":[[12.8, 0.029, 0.48, 0.98, 6.2, 29, 3.33, 1.2, 0.39, 75, 0.66]]}' 

I am guessing you ran the curl command in windows command prompt. Command prompt throws error if the data is passed that way in curl. The correct way is to replace single quotes with double quotes and escape all the double quotes in the data like in the below way.

curl -X POST -H "Content-Type:application/json; format=pandas-split" --data "{\"columns\":[\"alcohol\", \"chlorides\", \"citric acid\", \"density\", \"fixed acidity\", \"free sulfur dioxide\", \"pH\", \"residual sugar\", \"sulphates\", \"total sulfur dioxide\", \"volatile acidity\"],\"data\":[[12.8, 0.029, 0.48, 0.98, 6.2, 29, 3.33, 1.2, 0.39, 75, 0.66]]}" http://127.0.0.1:1234/invocations