Hardcode content type for POST requests

[tonyelhabr]

MLflow requires Content-Type = "application/json" for all POST requests.

[porterjames]

@tonyelhabr Any idea about the failed GitHub action?

Error: Error: package or namespace load failed for 'testthat' in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 namespace 'R6' 2.5.0 is being loaded, but >= 2.5.1 is required
Execution halted

[tonyelhabr]

@tonyelhabr Any idea about the failed GitHub action?

Error: Error: package or namespace load failed for 'testthat' in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 namespace 'R6' 2.5.0 is being loaded, but >= 2.5.1 is required
Execution halted

ugh, yes.

how about this--i'll revert internal bumping of mlflow until i get this fixed.

[mrkaye97]

😬

yet another breaking change from the maintainers, whaddaya know

[tonyelhabr]

Tests pass on local. Current setup requires an instance of mlflow running at http://localhost:5001 (see MLFLOW_TRACKING_URI.)

[tonyelhabr]

Tests pass on local. Current setup requires an instance of mlflow running at http://localhost:5001 (see MLFLOW_TRACKING_URI.)

I'll follow up at some point to fix the testing suite in the GHA.