Similar to #148, I'm can't seem to set a manual sessionID. Setting it in signedCookies like seems to be the solution doesn't seem to work:

app
  .use(function(req, res, next) {
    if(req.query.sessionID) {
      req.signedCookies["connect.sid"] = req.query.sessionID;
    }
    next();
  })
  .use(session({
    httpOnly: false,
    secret: 'secret',
    resave: false,
    saveUninitialized: true
  })
  .get('/session', function(req, res) {
    console.log('sessionID:', req.sessionID);
    req.session.tmp = req.session.tmp + 1 || 0;
    req.session.save();
    res.send('session: ' + req.session.tmp);
  })

When I hit http://localhost:3000/session?sessionID=42 a couple of times, the counter goes up. When I hit that exact same url in a different browser I expect it to pick up the count from the session, but it does not.

An observation: The log for req.sessionID is not what I gave to the query string, so I guess it's initialising its own sessionID instead.

I've also tried a custom genid like so:

  .use(session({
    httpOnly: false,
    secret: 'secret42',
    resave: false,
    saveUninitialized: true,
    genid: function(req) {
     return req.query.sessionID || uuid.v1();
   }
  })

This seemed like a cleaner solution anyway, but it also doesn't work for me. It sets the sessionID correctly for the first hit, but it won't update it for requests with a different sessionID.

Any help on this would be great!