fix(pricing): fallback to direct fetch after proxy transport errors

scripts/official_pricing_import_common_test.go

@@ -5,6 +5,7 @@ package main
 import (
 	"net/http"
 	"net/http/httptest"
+	"os"
 	"sync/atomic"
 	"testing"
 	"time"
@@ -44,6 +45,47 @@ func TestIsRetriablePricingFetchErrorRecognizesEOF(t *testing.T) {
 	}
 }
 
+func TestFetchRawPricingPageFallsBackWithoutProxyOnRetriableProxyFailure(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		_, _ = w.Write([]byte("ok"))
+	}))
+	defer server.Close()
+
+	oldHTTPProxy, hadHTTPProxy := os.LookupEnv("HTTP_PROXY")
+	oldHTTPSProxy, hadHTTPSProxy := os.LookupEnv("HTTPS_PROXY")
+	oldNoProxy, hadNoProxy := os.LookupEnv("NO_PROXY")
+	defer func() {
+		if hadHTTPProxy {
+			_ = os.Setenv("HTTP_PROXY", oldHTTPProxy)
+		} else {
+			_ = os.Unsetenv("HTTP_PROXY")
+		}
+		if hadHTTPSProxy {
+			_ = os.Setenv("HTTPS_PROXY", oldHTTPSProxy)
+		} else {
+			_ = os.Unsetenv("HTTPS_PROXY")
+		}
+		if hadNoProxy {
+			_ = os.Setenv("NO_PROXY", oldNoProxy)
+		} else {
+			_ = os.Unsetenv("NO_PROXY")
+		}
+	}()
+
+	_ = os.Setenv("HTTP_PROXY", "http://127.0.0.1:1")
+	_ = os.Unsetenv("HTTPS_PROXY")
+	_ = os.Unsetenv("NO_PROXY")
+
+	client := &http.Client{Timeout: 2 * time.Second}
+	body, err := fetchRawPricingPage(server.URL, "", client)
+	if err != nil {
+		t.Fatalf("fetchRawPricingPage returned error with proxy fallback enabled: %v", err)
+	}
+	if body != "ok" {
+		t.Fatalf("body = %q, want ok", body)
+	}
+}
+
 func TestFallbackModalityCanonicalizesAliases(t *testing.T) {
 	if got := fallbackModality("image"); got != "vision" {
 		t.Fatalf("fallbackModality(image) = %q, want vision", got)