Router | Android 平台一个简单的路由框架，包含路由和参数注入两部分功能。 | Router library

I finally found the solution to the problem:

Express regular request handlers are expected to have no more than 3 arguments as you can verify here.

And looking up Function.length:

length is a property of a function object, and indicates how many arguments the function expects, i.e. the number of formal parameters. This number excludes the rest parameter and only includes parameters before the first one with a default value.

It becomes clear why the second function works and the first one doesn't:

The issue seems to be that you are already on the "/country/:name" path and are clicking to visit another country. The router correctly updates the URL in the address bar, but because CountryDetail is already mounted it neglects to recompute the item and allCountries state. This is because the useEffect hook only runs once when the component mounts.

The name param (match.params.name) is actually a dependency for the GET requests, it should be added to the useEffect hook's dependency array.

Get data based on its id (Server Side)

Instead of this:

Hello I have found a solution. I had several instances running and therefore the npm start then selected a different port than I defined in the test. Have killed all processes on the port and restarted

You can make an internal call from the server itself, rather than from within a client. It would follow exactly the same logic (with the interval), but the code would be on the backend :)

Also if you'd like it a bit more well defined, you could use something like node-cron:

This may not answering your question but have you tried console.log(response.data) before setItem(response.data) to check the data you get from axios.get? sometimes console.log can help

There are some ways to pass the data to the new route.

you can render the submitted template file by passing data if you don't want to change the URI

If you want the specific URI you can pass the data as query params into your route you can see the example in the below https://stackoverflow.com/a/19038048/6551916