Why Are My Session Variables Not Persistent Across Requests Using Gorilla Sessions?

Session variables not maintained across requests using gorilla sessions

This issue can arise when using Gorilla Sessions middleware for managing session variables. The provided code snippet highlights several factors that may affect session persistence:

1. Session Path Configuration

The code sets the session path as "/loginSession". As a result, the session is only valid within the "/loginSession" path. To ensure session availability across all routes, the path should be set to "/":

<code class="go">func init() {
    store.Options = &sessions.Options{
        Domain:   "localhost",
        Path:     "/",
        MaxAge:   3600 * 8, // 8 hours
        HttpOnly: true,
    }
}</code>

2. Empty String Comparison

The code checks if session.Values["email"] == nil to determine if the value is an empty string. However, comparing an empty string to nil is incorrect. Instead, use type assertion to check for an empty string:

<code class="go">if val, ok := session.Values["email"].(string); ok {
    if val == "" {
        // Do something...
    }
}</code>

3. Handling Errors

It's essential to handle errors while saving the session:

<code class="go">err := sessionNew.Save(req, res)
if err != nil {
    // Handle the error
}</code>

4. Session Validation Order

The code serves static files before validating the session in the SessionHandler function. To ensure proper session validation, the session should be validated first:

<code class="go">func SessionHandler(res http.ResponseWriter, req *http.Request) {
    session, err := store.Get(req, "loginSession")
    if err != nil {
        // Handle the error
    }

    // Validate the session here...

    // Serve static files if the session is valid...
}</code>

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