In case of image message, the body can be a JSON object (ImageInfo) and ngSanitize does not like that (ie it generates exception in the console)
Basic Usage
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The Synapse web client needs to be hosted by a basic HTTP server.
You can use the Python simple HTTP server::
$ python -m SimpleHTTPServer
Then, open this URL in a WEB browser::
http://127.0.0.1:8000/