disable cacheability assert for proxy

Disable the check for GET request if we're running behind a proxy.

test/core/end2end/end2end_tests.h

@@ -42,6 +42,7 @@ typedef struct grpc_end2end_test_config grpc_end2end_test_config;
 #define FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION 1
 #define FEATURE_MASK_SUPPORTS_HOSTNAME_VERIFICATION 2
 #define FEATURE_MASK_SUPPORTS_PER_CALL_CREDENTIALS 4
+#define FEATURE_MASK_SUPPORTS_REQUEST_PROXYING 8
 
 #define FAIL_AUTH_CHECK_SERVER_ARG_NAME "fail_auth_check"
 

test/core/end2end/fixtures/h2_proxy.c

@@ -113,7 +113,8 @@ void chttp2_tear_down_fullstack(grpc_end2end_test_fixture *f) {
 
 /* All test configurations */
 static grpc_end2end_test_config configs[] = {
-    {"chttp2/fullstack+proxy", FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION,
+    {"chttp2/fullstack+proxy", FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION |
+                                   FEATURE_MASK_SUPPORTS_REQUEST_PROXYING,
      chttp2_create_fixture_fullstack, chttp2_init_client_fullstack,
      chttp2_init_server_fullstack, chttp2_tear_down_fullstack},
 };

test/core/end2end/fixtures/h2_ssl_proxy.c

@@ -184,6 +184,7 @@ static void chttp2_init_server_simple_ssl_secure_fullstack(
 static grpc_end2end_test_config configs[] = {
     {"chttp2/simple_ssl_fullstack",
      FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION |
+         FEATURE_MASK_SUPPORTS_REQUEST_PROXYING |
          FEATURE_MASK_SUPPORTS_PER_CALL_CREDENTIALS,
      chttp2_create_fixture_secure_fullstack,
      chttp2_init_client_simple_ssl_secure_fullstack,

test/core/end2end/tests/simple_cacheable_request.c

@@ -235,7 +235,11 @@ static void test_cacheable_request_response_with_metadata_and_payload(
   GPR_ASSERT(0 == strcmp(details, "xyz"));
   GPR_ASSERT(0 == strcmp(call_details.method, "/foo"));
   GPR_ASSERT(0 == strcmp(call_details.host, "foo.test.google.fr"));
-  GPR_ASSERT(GRPC_INITIAL_METADATA_CACHEABLE_REQUEST & call_details.flags);
+  if (config.feature_mask & FEATURE_MASK_SUPPORTS_REQUEST_PROXYING) {
+    // Our simple proxy does not support cacheable requests
+  } else {
+    GPR_ASSERT(GRPC_INITIAL_METADATA_CACHEABLE_REQUEST & call_details.flags);
+  }
   GPR_ASSERT(was_cancelled == 0);
   GPR_ASSERT(byte_buffer_eq_string(request_payload_recv, "hello world"));
   GPR_ASSERT(byte_buffer_eq_string(response_payload_recv, "hello you"));