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Is it possible to update a service URL in an existing ArcGIS Online web map?
Yes, the functionality to update or edit a service URL in an existing web map is currently available in ArcGIS Online.
As of the December 2017 update to ArcGIS Online, the URL of layers in the map can be updated from HTTP to HTTPS, or from staging versions of ArcGIS service layers to production versions. This is available via the Settings tab for the map item.
ArcGIS Online inspects each layer in the map. If any layers use HTTP, ArcGIS Online attempts to make a request to the same layer using HTTPS, and then updates the map and any associated layer items that users own or administer. If a layer does not support HTTPS, users are notified and the layer URL is not updated. For more details, please refer to the following help page: Layer Settings.