Try fix

Author: iamluc

ext/auto_flush.c

@@ -141,7 +141,7 @@ char *ddtrace_agent_url(void) {
         return zend_strndup(ZSTR_VAL(hostname), ZSTR_LEN(hostname));
     }
 
-    if (ZSTR_LEN(hostname) > 0 && zai_config_memoized_entries[DDTRACE_CONFIG_DD_AGENT_HOST].name_index != ZAI_CONFIG_ORIGIN_DEFAULT) {
+    if (ZSTR_LEN(hostname) > 0) {
         bool isIPv6 = memchr(ZSTR_VAL(hostname), ':', ZSTR_LEN(hostname));
 
         int64_t port = get_global_DD_TRACE_AGENT_PORT();

ext/configuration.h

@@ -100,7 +100,7 @@ enum ddtrace_sampling_rules_format {
     CONFIG(STRING, DD_TRACE_SOURCES_PATH, DD_DEFAULT_SOURCES_PATH, .ini_change = zai_config_system_ini_change) \
     CONFIG(BOOL, DD_AUTOLOAD_NO_COMPILE, "false", .ini_change = zai_config_system_ini_change)                  \
     CONFIG(STRING, DD_TRACE_AGENT_URL, "", .ini_change = zai_config_system_ini_change)                         \
-    CONFIG(STRING, DD_AGENT_HOST, "localhost", .ini_change = zai_config_system_ini_change)                     \
+    CONFIG(STRING, DD_AGENT_HOST, "", .ini_change = zai_config_system_ini_change)                     \
     CONFIG(STRING, DD_DOGSTATSD_URL, "http://localhost:8125")                                                  \
     CONFIG(STRING, DD_DOGSTATSD_HOST, "localhost")                                                             \
     CONFIG(STRING, DD_API_KEY, "", .ini_change = zai_config_system_ini_change)                                 \