Why is simple application routing not working on github pages?

Question

GitHub

Repository https://github.com/wsavd/joonline (in the master branch) with an example of page routing from off. documentation
By the local machine everything works, I fill in on gh-pages - a white background.
Here is the uploaded application https://wsavd.github.io/joonline

Answer 1

Because the routes are not suitable. Do you have :

<Router>
    <App>
      <Route exact path="/" component={Home}/>
      <Route path="/item0" component={Item0}/>
      <Route path="/item1" component={Item1}/>
    </App>  
  </Router>,

And on GH pages your route is /joonline/ . Fortunately, there is a simple solution - specify the basepath ( documentation ) against which all application routes will be built:

<Router  basename="/joonline"/>
    <App>
      <Route exact path="/" component={Home}/>
      <Route path="/item0" component={Item0}/>
      <Route path="/item1" component={Item1}/>
    </App>  
  </Router>,