[BUG] mlflow tutorial: error running curl command on Windows 10

I am attempting to use the mlflow tutorial https://www.mlflow.org/docs/latest/tutorials-and-examples/tutorial.html#serving-the-model.

The curl invocation line when trying to call the served model is not working for me.

Windows 10.

Attempted on curl 7.55.1 and on 7.71.1.

Error:

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
curl: (6) Could not resolve host: chlorides,
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: density,
curl: (3) URL using bad/illegal format or missing URL
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: pH,
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: sulphates,
curl: (3) URL using bad/illegal format or missing URL
curl: (3) unmatched close brace/bracket in URL position 17:
volatile acidity],data:[[12.8,

Willingness to contribute

The MLflow Community encourages bug fix contributions. Would you or another member of your organization be willing to contribute a fix for this bug to the MLflow code base?

• Yes. I can contribute a fix for this bug independently.
• [x ] Yes. I would be willing to contribute a fix for this bug with guidance from the MLflow community.
• No. I cannot contribute a bug fix at this time.

System information

• Have I written custom code (as opposed to using a stock example script provided in MLflow): no
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Windows 10
• MLflow installed from (source or binary): binary
• MLflow version (run mlflow --version): 1.10.0
• Python version: 3.7.8
• npm version, if running the dev UI:
• Exact command to reproduce: 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

Describe the problem

I am attempting to use the mlflow tutorial https://www.mlflow.org/docs/latest/tutorials-and-examples/tutorial.html#serving-the-model.

Simply following the tutorial and it does not work.

Code to reproduce issue

the curl command above does not work

Other info / logs

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
curl: (6) Could not resolve host: chlorides,
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: density,
curl: (3) URL using bad/illegal format or missing URL
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: pH,
curl: (3) URL using bad/illegal format or missing URL
curl: (6) Could not resolve host: sulphates,
curl: (3) URL using bad/illegal format or missing URL
curl: (3) unmatched close brace/bracket in URL position 17:
volatile acidity],data:[[12.8,

What component(s), interfaces, languages, and integrations does this bug affect?

Components

• area/artifacts: Artifact stores and artifact logging
• area/build: Build and test infrastructure for MLflow
• [] area/docs: MLflow documentation pages
• area/examples: Example code
• area/model-registry: Model Registry service, APIs, and the fluent client calls for Model Registry
• area/models: MLmodel format, model serialization/deserialization, flavors
• area/projects: MLproject format, project running backends
• area/scoring: Local serving, model deployment tools, spark UDFs
• area/server-infra: MLflow server, JavaScript dev server
• area/tracking: Tracking Service, tracking client APIs, autologging

Interface

• area/uiux: Front-end, user experience, JavaScript, plotting
• area/docker: Docker use across MLflow’s components, such as MLflow Projects and MLflow Models
• area/sqlalchemy: Use of SQLAlchemy in the Tracking Service or Model Registry
• [x ] area/windows: Windows support

Language

• language/r: R APIs and clients
• language/java: Java APIs and clients
• language/new: Proposals for new client languages

Integrations

• integrations/azure: Azure and Azure ML integrations
• integrations/sagemaker: SageMaker integrations
• integrations/databricks: Databricks integrations

[extrospective]

Thank you, I was able to get it working by doing the following quoting:

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://localhost:1234/invocations

What I did, per the stackoverflow link:

• Converted the outer single quotes into double quotes
• Took the double quotes embedded within the double quotes and escaped them with a backslash

This worked.

I did try PowerShell and ran into this error:

Invoke-WebRequest : Cannot bind parameter 'Headers'. Cannot convert the "Content-Type:application/json;
format=pandas-split" value of type "System.String" to type "System.Collections.IDictionary".
At line:1 char:17
+ ...  -X POST -H "Content-Type:application/json; format=pandas-split" --da ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Invoke-WebRequest], ParameterBindingException
    + FullyQualifiedErrorId : CannotConvertArgumentNoMessage,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

I was not trying to get PowerShell working, but documenting in case one wants to support PowerShell or someone else is searching for solutions.

I’m all set.

I might suggest the documentation get some sort of update to make the tutorial work for all. It’s too bad it might not look pretty, and will be harder for a newbie to interpret.

[potoo0]

There a easier way than escaping all those symbols in powershell: use Replace build-in string method, demo:

curl.exe http://127.0.0.1:5051/invocations `
	-X POST `
	-H "Content-Type:application/json; format=pandas-split" `
	--data '{"columns":["feature1", "feature2", "feature3"],"data":[[1.2, -2, 2.6]]}'.Replace('"', '\"')