Using curl to reproduce an operation a user just managed to do with his or her browser is a common request and area people ask for help about.
How do you get a curl command line to get a resource, just like the browser would get it, nice and easy? Chrome, Firefox, Edge and Safari all have this feature.
You get the site shown with Firefox's network tools. You then right-click on the specific request you want to repeat in the "Web Developer->Network" tool when you see the HTTP traffic, and in the menu that appears you select "Copy as cURL". Like this screenshot below shows. The operation then generates a curl command line to your clipboard and you can then paste that into your favorite shell window. This feature is available by default in all Firefox installations.
copy as curl with Firefox
From Chrome and Edge
When you pop up the More tools->Developer mode in Chrome or Edge, and you select the Network tab you see the HTTP traffic used to get the resources of the site. On the line of the specific resource you are interested in, you right-click with the mouse and you select "Copy as cURL" and it will generate a command line for you in your clipboard. Paste that in a shell to get a curl command line that makes the transfer. This feature is available by default in all Chrome and Chromium installations.
copy as curl with Chrome
In Safari, the "development" menu is not visible until you go into preferences->Advanced and enable it. But once you have done that, you can select Show web inspector in that development menu and get to see a new console pop up that is similar to the development tools of Firefox and Chrome.
Select the network tab, reload the web page and then you can right click the particular resources that you want to fetch with curl, as if you did it with Safari..
copy as curl with Safari
On Firefox, without using the devtools
If this is something you would like to get done more often, you probably find using the developer tools a bit inconvenient and cumbersome to pop up just to get the command line copied. Then cliget is the perfect add-on for you as it gives you a new option in the right-click menu, so you can get a quick command line generated really quickly, like this example when I right-click an image in Firefox:
cliget with Firefox
These methods all give you a command line to reproduce their HTTP transfers. You will also learn they are still often not the perfect solution to your problems. Why? Well mostly because these tools are written to rerun the exact same request that you copied, while you often want to rerun the same logic but not sending an exact copy of the same cookies and file contents etc.
These tools will give you command lines with static and fixed cookie contents to send in the request, because that is the contents of the cookies that were sent in the browser's requests. You will most likely want to rewrite the command line to dynamically adapt to whatever the content is in the cookie that the server told you in a previous response. And so on.
The copy as curl functionality is also often notoriously bad at using -F and instead they provide handcrafted --data-binary solutions including the mime separator strings etc.