1.5 Cookies with javascript
These days a lot of the web is built up by javascript. The webbrowser loads complete programs that render the page you see. These javascript programs can also set and access cookies.
Since curl and libcurl are plain HTTP clients without any knowledge of or capability to handle javascript, such cookies will not be detected or used.
Often, if you want to mimic what a browser does on such web sites, you can record web browser HTTP traffic when using such a site and then repeat the cookie operations using curl or libcurl.
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