fix(agent): improve url handling to not break urls with encoded characters

agent/pkg/handler/proxy_http.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httputil"
+	"strings"
 	"time"
 
 	"github.com/yusing/godoxy/agent/pkg/agent"
@@ -43,10 +44,22 @@ func ProxyHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	r.URL.Scheme = ""
-	r.URL.Host = ""
-	r.URL.Path = r.URL.Path[agent.HTTPProxyURLPrefixLen:] // strip the {API_BASE}/proxy/http prefix
-	r.RequestURI = r.URL.String()
+	// Strip the {API_BASE}/proxy/http prefix while preserving URL escaping.
+	//
+	// NOTE: `r.URL.Path` is decoded. If we rewrite it without keeping `RawPath`
+	// in sync, Go may re-escape the path (e.g. turning "%5B" into "%255B"),
+	// which breaks urls with percent-encoded characters, like Next.js static chunk URLs.
+	prefix := agent.APIEndpointBase + agent.EndpointProxyHTTP
+	r.URL.Path = strings.TrimPrefix(r.URL.Path, prefix)
+	if r.URL.RawPath != "" {
+		if after, ok := strings.CutPrefix(r.URL.RawPath, prefix); ok {
+			r.URL.RawPath = after
+		} else {
+			// RawPath is no longer a valid encoding for Path; force Go to re-derive it.
+			r.URL.RawPath = ""
+		}
+	}
+	r.RequestURI = ""
 
 	rp := &httputil.ReverseProxy{
 		Director: func(r *http.Request) {