Use the built-in tools or available plug-ins for any browser, such as Firebug for Firefox or Chrome Developer Tools . Each of them has a tab on the network that you can use to view all GET / POST requests and responses to any type of resource.
Wireshark lets you look deeper. While browser tools will usually listen to HTTP traffic, Wireshark will allow you to listen to other protocols and each packet sent through them.
If you work with the REST API, you will be interested in using the browser tools to view incoming and outgoing calls.
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