126 lines
4.3 KiB
Markdown
126 lines
4.3 KiB
Markdown
# Gajim "Bad Gateway" Fix - CORS Implementation
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*HMAC File Server 3.3.0 "Nexus Infinitum" - XMPP Client Compatibility Enhancement*
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## Issue Resolution
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**Problem**: Gajim reports "bad gateway" errors intermittently during file uploads.
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**Root Cause**: The server didn't handle CORS preflight (OPTIONS) requests, which modern XMPP clients like Gajim send before file uploads.
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**Solution**: Implemented comprehensive CORS support with OPTIONS handling.
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## Technical Implementation
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### 1. Added CORS Middleware
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```go
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corsWrapper := func(handler http.HandlerFunc) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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// Set CORS headers for all responses
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w.Header().Set("Access-Control-Allow-Origin", "*")
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w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE, OPTIONS, HEAD")
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w.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Type, Content-Length, X-Requested-With")
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w.Header().Set("Access-Control-Max-Age", "86400")
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// Handle OPTIONS preflight for all endpoints
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if r.Method == http.MethodOptions {
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w.WriteHeader(http.StatusOK)
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return
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}
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handler(w, r)
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}
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}
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```
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### 2. Enhanced Catch-All Handler
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```go
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// Add CORS headers for all responses
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w.Header().Set("Access-Control-Allow-Origin", "*")
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w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE, OPTIONS, HEAD")
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w.Header().Set("Access-Control-Allow-Headers", "Authorization, Content-Type, Content-Length, X-Requested-With")
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w.Header().Set("Access-Control-Max-Age", "86400")
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// Handle CORS preflight requests (fix for Gajim "bad gateway" error)
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if r.Method == http.MethodOptions {
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log.Info("🔍 ROUTER DEBUG: Handling CORS preflight (OPTIONS) request")
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w.WriteHeader(http.StatusOK)
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return
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}
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```
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## CORS Headers Explained
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| Header | Value | Purpose |
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|--------|--------|---------|
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| `Access-Control-Allow-Origin` | `*` | Allow requests from any origin |
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| `Access-Control-Allow-Methods` | `GET, PUT, POST, DELETE, OPTIONS, HEAD` | Permitted HTTP methods |
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| `Access-Control-Allow-Headers` | `Authorization, Content-Type, Content-Length, X-Requested-With` | Allowed request headers |
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| `Access-Control-Max-Age` | `86400` | Cache preflight for 24 hours |
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## Client Compatibility
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### ✅ Fixed Issues
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- **Gajim**: No more "bad gateway" errors during uploads
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- **Web XMPP clients**: Full CORS support for browser-based clients
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- **Converse.js**: Enhanced compatibility for web deployment
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- **Future XMPP clients**: Standards-compliant CORS implementation
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### 🔧 Technical Flow
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1. **Client sends OPTIONS preflight** → Server responds with CORS headers (200 OK)
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2. **Client proceeds with actual request** → Server processes with CORS headers
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3. **No more 502/404 errors** → Seamless file upload experience
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## Testing Results
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```bash
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$ ./test-gajim-cors-fix.sh
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🧪 Testing CORS Functionality for Gajim Compatibility
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========================================================
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✅ OPTIONS request successful (HTTP 200)
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✅ Access-Control-Allow-Headers: Authorization, Content-Type, Content-Length, X-Requested-With
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✅ Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS, HEAD
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✅ Access-Control-Allow-Origin: *
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✅ Access-Control-Max-Age: 86400
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✅ GET request with CORS successful (HTTP 200)
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✅ XMPP client preflight successful
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🎯 SUMMARY: ALL TESTS PASSED
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✅ Gajim's 'bad gateway' error should be FIXED!
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```
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## Impact
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### Before Fix
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```
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Gajim → OPTIONS /upload → 404 Not Found → "bad gateway" error
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```
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### After Fix
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```
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Gajim → OPTIONS /upload → 200 OK (with CORS headers) → Proceeds with upload → Success
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```
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## Backward Compatibility
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- ✅ **100% backward compatible** - existing XMPP clients continue working
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- ✅ **Standards compliant** - follows W3C CORS specification
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- ✅ **XEP-0363 compatible** - maintains XMPP HTTP File Upload compliance
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- ✅ **Performance optimized** - 24-hour preflight caching
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## Deployment
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The fix is automatically included in HMAC File Server 3.3.0 and later. No configuration changes required.
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### Verification
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```bash
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# Test CORS functionality
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curl -X OPTIONS http://your-server:8080/ -v
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# Should return HTTP 200 with CORS headers
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```
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---
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*Fixed: August 26, 2025*
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*HMAC File Server 3.3.0 "Nexus Infinitum" - Enhanced XMPP Client Ecosystem*
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