Some pitfalls in Python using the selenium library to add cookie information to the driver

Maybe you will encounter this situation when browsing some web pages. The content of some web pages is set to be visible to login.

If you want to use the driver to drive the browser to browse hidden content, you need to add cookie information to it in advance. I have encountered some pitfalls when using it these days. Let me briefly explain.

First, we create a driver:

The created driver has a special method for adding cookie information, driver.add_cookie(), and the parameter it accepts is a dictionary. Back to the topic of this article, let’s talk about the pitfalls.

The key names of the dictionary parameters accepted by the add_cookie() method are not arbitrary.

The information around the equal sign of the obtained content cannot be taken for granted. His key names are all meaningful. Generally, just remember name and value, which represent the name of the cookie and the dynamically generated value respectively.

Ensure that the obtained cookie content is valid.

For example, this is the cookie content I saw after logging into a website:

Of course, if you don’t know, you can try more, but if this is your first time using it, add_cookie() method, it is recommended that you check pit three before trying it!

When you happily enter the target URL and want to add good cookie information to the driver:

It may report an error. Note that it is possible.

If you encounter an error similar to Message: unable to set cookie, it is recommended to use a more secure method:

That is, add cookie information to the login page, and then visit the target URL .

If there are any errors, please correct them~