We have an app that loads a list of reports. When a report is selected, a report viewer page is loaded. It contains a set of parameters. In this stage, we get a http 400 error because it is the hitting the GetParameters endpoint right away. The user has not selected any parameters. It should only hit this endpoint when the user has selected the parameters and runs the report.

This is not the behavior in the HTML viewer.

In the images attached, the Initial Load image is the error we get when the report viewer page is loaded.
The Report Source is the payload when the GetParameters endpoint is called. As you can see it's empty since the report is not ran yet.
In the Running image, the error is when the user runs the report.