session.get() returns None on first load and refresh for some unknown reason.

[Grafcube]

I have a handler that is meant to check whether the user is signed in. I am also using leptos for ssr+hydration.

let id = match session.get::<String>("id") {
    // ---
}

I noticed that for whatever reason, session.get() returns a None whenever I first load the page or refresh it. It doesn't happen when I navigate to the page with client side navigation.

To debug this, I logged the HttpRequest for every call to this function. In every case where I expected a cookie, I found one in the request.

For more context:

• The function itself: This is called whenever I expect it to be called, but returns a None when it shouldn't.
• The leptos server function (for ssr): Essentially, this is the actual function registered as a route to actix. In order to have multiple ways to call the validate function, I separated it out and had this function forward the extractors to it (the details aren't relevant to the issue I think).

And finally, here are the HttpRequests that I logged:

When refreshing/first load:

HttpRequest HTTP/1.1 GET:/
      headers:
        "cache-control": "no-cache"
        "accept-encoding": "gzip, deflate, br"
        "cookie": "id=Whr1WYUouV9R3eKIeM0u93mvbdxrdfza9Yby0fB8nPRy1ZAf0CbJcYzE2o5SrZmkzEzGTqb4YXljbERFWgvhUc50pjD62iPFsL7dEcphLECtROtBwEOXxed6rP8%3D"
        "upgrade-insecure-requests": "1"
        "host": "localhost:3000"
        "dnt": "1"
        "sec-fetch-mode": "navigate"
        "connection": "keep-alive"
        "pragma": "no-cache"
        "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/112.0"
        "accept-language": "en-GB,en-US;q=0.7,en;q=0.3"
        "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/jxl,image/webp,*/*;q=0.8"
        "sec-fetch-site": "cross-site"
        "sec-fetch-dest": "document"

When navigating to the page:

HttpRequest HTTP/1.1 POST:/server/validate17522352961494492587
      params: Path { path: Url { uri: /server/validate17522352961494492587, path: None }, skip: 36, segments: [("tail", Segment(8, 36))] }
      headers:
        "content-type": "application/x-www-form-urlencoded"
        "cookie": "id=Whr1WYUouV9R3eKIeM0u93mvbdxrdfza9Yby0fB8nPRy1ZAf0CbJcYzE2o5SrZmkzEzGTqb4YXljbERFWgvhUc50pjD62iPFsL7dEcphLECtROtBwEOXxed6rP8%3D"
        "host": "localhost:3000"
        "dnt": "1"
        "referer": "http://localhost:3000/"
        "sec-fetch-mode": "cors"
        "accept-language": "en-GB,en-US;q=0.7,en;q=0.3"
        "accept": "application/x-www-form-urlencoded"
        "connection": "keep-alive"
        "sec-fetch-dest": "empty"
        "sec-fetch-site": "same-origin"
        "user-agent": "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/112.0"
        "origin": "http://localhost:3000"
        "accept-encoding": "gzip, deflate, br"
        "content-length": "0"

The cookie is in both requests but session.get::<String>("id") still returns None for the first one. Any help is appreciated, TIA.

[gbj]

To add a little more context since we've been working on debugging this together: I'm pretty sure what's going on here is that the initial response is returning an HTML stream, and that the session is being checked during one of the later chunks. The later navigation is just calling accessing the session data in a more traditional request/response fetch, and works properly.

I have run into similar issues with streaming responses and other crates (for example, an Axum auth crate) — accessing the session before sending the first chunk returns correctly, accessing the session during a later chunk does not.