Try the Misty API with a proxy
Summary
In this tutorial, you are shown how to instantiate a workspace with a Misty robot (for example, fixed_misty2) to control the robot through the Misty Command Center, to directly make Misty REST API calls through a secure proxy. (Note that the Misty Command Center is a product of Misty Robotics, Inc., and NOT A PART OF rerobots.)
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Searching
To begin, sign-in to https://rerobots.net, and go to the search page. It should look like the following:
For this tutorial, we want to use a workspace deployment that has the type fixed_misty2. If one is not already listed, enter "misty" into the search field, or try the following URL: https://rerobots.net/search?q=fixed_misty2
Click on the photo or the "deployment id" of one of the items in the search results. You will get a brief description of the workspace, which should look like the following:
Requesting an instance
To request to use the workspace deployment that you are viewing, click the "request instance" button. The next page provides some choices about the instance that you will create. It should look like:
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If your request is accepted, then you will be redirected to a page that shows information about the new instance.
When you are ready, select the link "Download private key.", which will download a file named key.pem. Be careful to only click the link when you are ready for the download. If you are not ready yet, then ignore the message. The same URL is listed later in the "alerts" panel.
Starting the Misty proxy
Go to your rerobots instances list. There should be a fixed_misty2 instance that you just created. After several minutes of initializing, during which the robot and other parts of the workspace are prepared, the instance status will be READY. Select it from the list to get instance details, resulting in a page like the following:
In the panel titled "Misty robot proxy", select the link "start proxy". This will start a proxy server through which you can remotely make API calls on the Misty robot.
In this example, you would copy-and-paste the first address (proxy.rerobots.net:32912/61ab371e4...) into the "Robot IP Address" box at http://sdk.mistyrobotics.com/command-center/.
To view the robot, select the link "start camera stream" in the panel titled "camera streams". This will start the camera stream and generate a URL for viewing it.
Find the link with text "open camera stream". Open this link in a new browser window. Try arranging the camera stream window on one side of your desktop and the Misty Command Center window on the other side, as shown in this screenshot: 
A similar arrangement is shown in the following video:
The general case
The mistyproxy add-on provides another URL prefix that has the scheme HTTPS and provides a secure connection from your computer to the Misty robot. (The Explorer website only accepts HTTP.) If you are developing your own code, then you should use this one.
For example, if the URL prefix is https://proxy.rerobots.net/2c748d9af25319fcb5ee5dea70400c9f4fbb8e71a5c2b31cde7ee85838b1db09/mistyproxy/c9ab91885e059d56263e514a6812b9d4a2e2b2ef71fdcb13651da9bc2e6064b3, then you can make Misty API calls from the command-line with cURL:
export MISTYPREFIX=https://proxy.rerobots.net/2c748d9af25319fcb5ee5dea70400c9f4fbb8e71a5c2b31cde7ee85838b1db09/mistyproxy/c9ab91885e059d56263e514a6812b9d4a2e2b2ef71fdcb13651da9bc2e6064b3
curl $MISTYPREFIX/api/device
which demonstrates GET /api/device. Notice that we save the URL prefix to the shell variable $MISTYPREFIX, which makes the curl command concise.
Conclusion
When you are done, return to https://rerobots.net/instances, find the instance that you created in the table, and push the terminate button.