23 days ago
For the last couple of days I've been struggling to do something very trivial: put a reverse proxy in front of my web project.
[Caddy] ---> [NodeJS web project]
All requests were returning 502 bad gateway
I made sure my Node project was binding to "::" and "0.0.0.0" - same error, 502 bad gateway and timeout when I tried to access from Caddy
I switched to NGINX ---> Same issue
I wrote a simple reverse proxy ---> Same issue
I installed Tailscale and tried to curl [NodeJS web project] ---> same thing!
When I use a custom domain I am able to access the web project, but not through the internal network
So I wrote a very simple web server to debug.
The first endpoint "/" returns text and it's working.
The second endpoint "/html" returns HTML content and it's not working.
Did I miss something in the Railway docs? Is there a firewall blocking some content types like HTML? What am I doing wrong here?
package main
import (
"fmt"
"log"
"net/http"
"os"
"time"
)
func main() {
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
host := os.Getenv("HOST")
if host == "" {
host = "0.0.0.0"
}
// Route: / - Plain text "Hello World"
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// Only handle root path for this handler
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
timestamp := time.Now().Format(time.RFC3339)
// Log request
log.Printf("[%s] %s %s from %s", timestamp, r.Method, r.URL.Path, r.RemoteAddr)
log.Printf("Host: %s", r.Host)
log.Printf("Headers: %v", r.Header)
// Set response headers
w.Header().Set("Content-Type", "text/plain")
w.Header().Set("X-Server", "Go-Simple-Server")
// Write plain text response
fmt.Fprintf(w, "Hello World\n")
log.Printf("[%s] Response sent: 200 OK (text/plain)", timestamp)
})
// Route: /html - HTML page with request info
http.HandleFunc("/html", func(w http.ResponseWriter, r *http.Request) {
timestamp := time.Now().Format(time.RFC3339)
// Log request
log.Printf("[%s] %s %s from %s", timestamp, r.Method, r.URL.Path, r.RemoteAddr)
log.Printf("Host: %s", r.Host)
log.Printf("Headers: %v", r.Header)
// Set response headers
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Header().Set("X-Server", "Go-Simple-Server")
// Write HTML response
html := `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Go Test Server</title>
<style>
body {
font-family: system-ui, -apple-system, sans-serif;
max-width: 800px;
margin: 50px auto;
padding: 20px;
background: #f5f5f5;
}
.container {
background: white;
padding: 30px;
border-radius: 8px;
box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
h1 { color: #2563eb; }
.success { color: #16a34a; font-weight: bold; }
.info {
background: #eff6ff;
padding: 15px;
border-radius: 4px;
margin: 15px 0;
}
pre {
background: #1f2937;
color: #f3f4f6;
padding: 15px;
border-radius: 4px;
overflow-x: auto;
}
</style>
</head>
<body>
<div class="container">
<h1>✓ Go Test Server</h1>
<p class="success">Server is responding correctly!</p>
<div class="info">
<strong>Request Info:</strong>
<pre>Method: %s
Path: %s
Host: %s
Remote: %s
Time: %s</pre>
</div>
<div class="info">
<strong>Server Info:</strong>
<ul>
<li>Language: Go</li>
<li>Handler: net/http</li>
<li>PID: %d</li>
</ul>
</div>
</div>
</body>
</html>
`
fmt.Fprintf(w, html, r.Method, r.URL.Path, r.Host, r.RemoteAddr, timestamp, os.Getpid())
log.Printf("[%s] Response sent: 200 OK (text/html)", timestamp)
})
addr := fmt.Sprintf("%s:%s", host, port)
log.Println("================================================================================")
log.Println("[GO SERVER] Starting...")
log.Printf("[INFO] Listening on http://%s", addr)
log.Printf("[INFO] PID: %d", os.Getpid())
log.Println("================================================================================")
if err := http.ListenAndServe(addr, nil); err != nil {
log.Fatalf("[ERROR] Server failed to start: %v", err)
}
}
10 Replies
23 days ago
Hey there! We've found the following might help you get unblocked faster:
If you find the answer from one of these, please let us know by solving the thread!
23 days ago
Hello!
We're acknowledging your issue and attaching a ticket to this thread.
We don't have an ETA for it, but, our engineering team will take a look and you will be updated as we update the ticket.
Please reply to this thread if you have any questions!
23 days ago
Hello,
This is not a firewall that is blocking HTML, the issue is with the beta IPv4 private networking feature you have enabled, sometimes the IPv4 private networking will cause packets to be dropped.
Please disable that flag, and then fully recreate the environment in a new project.
Best,
Brody
Status changed to Awaiting User Response Railway • 23 days ago
23 days ago
Hello,
Thanks for the quick response.
Please note that your support tool is deleting some messages.
It happened to me a couple of times, and other users are also reporting this behavior.
I posted a message just 1 hour after yours and I couldn't find it.
Status changed to Awaiting Railway Response Railway • 23 days ago
23 days ago
I created a new project: 81f749fc-6b7d-4701-9ad4-0810a35927e4
PROXY (Caddy) -----> WEBSITE (Astro)
The website is listening on 0.0.0.0:8080 (I also tried :: :8080) and can be accessed publicly on https://bantu-sites-staging.up.railway.app/ (it works)
For the proxy i'm using Caddy>
{
admin off
persist_config off
auto_https off
log {
format json
}
servers {
trusted_proxies static private_ranges
}
}
:{$PORT} {
log {
format json
}
# Health check (bypass auth)
handle /health {
respond {"status":"UP"} 200
}
# Blog proxy - proxies all other paths to frontend
handle {
reverse_proxy {$FRONTEND_URL}
}
}In this case FRONTEND_URL is http://bantu-sites.railway.internal:8080
When I use the proxy https://bantu-front-gateway-production.up.railway.app/ I get a 502 error.
Here is my astro config:
// @ts-check
import node from "@astrojs/node";
import { defineConfig } from "astro/config";
// https://astro.build/config
export default defineConfig({
output: "server",
adapter: node({
mode: "standalone",
}),
server: {
host: "0.0.0.0",
port: 8080,
},
});23 days ago
I set the env variable HOST="::" on the astro project and it's working now
23 days ago
I created a new environment in the same project after disabling the flag.
So far so good.
Status changed to Awaiting User Response Railway • 23 days ago
Status changed to Solved brody • 23 days ago
22 days ago
✅ The ticket Packet loss in Private Networking has been marked as completed.
22 days ago
Hello,
Update here: The previously mentioned issues with IPv4 private networking have been fixed. However, you will need to redeploy the affected services.
Status changed to Awaiting User Response Railway • 22 days ago
8 days ago
This thread has been marked as solved automatically due to a lack of recent activity. Please re-open this thread or create a new one if you require further assistance. Thank you!
Status changed to Solved Railway • 8 days ago