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How to view the latest version of the documentation?

It seems that the gh-pages branch is displayed.
I don't see the following commit 69dc7eb at: https://docs.libcpr.org/introduction.html#post-requests

When I send a post request using libcpr or Python's requests, the server returns:

{'msg':'illegal request method','returnCode':'00405','data':'Content type'application/x-www-form-urlencoded; charset=UTF-8'not supported'}'.

C++ Code:

cpr::Response r = cpr::Post(cpr::Url{ "https://ec.95306.cn/api/bl/queryProduct/querySkb" },
	cpr::Timeout{ 7000 },
	cpr::Payload{ {"gbcc", "X8003"} });

Python Code:

data = {
    "gbcc": "X8003"
}
r = requests.post("https://ec.95306.cn/api/bl/queryProduct/querySkb", data=data)

It is written in the docs of Python's requests that:
There are times that you may want to send data that is not form-encoded. If you pass in a string instead of a dict, that data will be posted directly.andInstead of encoding the dict yourself, you can also pass it directly using the json parameter (added in version 2.4.2) and it will be encoded automatically.
So I use:

data = {
    "gbcc": "X8003"
}
r = requests.post("https://ec.95306.cn/api/bl/queryProduct/querySkb", json=data)

In this way, it works normally.
So how do you use libcurl to do this?

Another problem is how to pass a numeric value with payload, like this:

cpr::Payload{ {"skbbbh",1} });

I'm using the Session object to re-use connections for multiple requests, but what if I also have some requests that are sent by different threads? Session object is not thread-safe, so how am I supposed to optimize connection re-use when having multiple threads?

In general, it would be very useful to have a doc section on how the library API is supposed to be used for a multi-threaded application, and how to optimize and re-use connections in such scenario.