It's sending an HTTP format message to an HEC whose default source type is also set to _json. Here is a dump of the request: POST /services/collector/event?host=myhost&source=KEN-STUFF&sourcetype=_json&index=galaxy&channel=FE0ECFAD-13D5-401B-847D-77833BD77131 HTTP/1.1 Host: <target URL> User-Agent: XYGATEMA Connection: keep-alive Content-Type: application/json Authorization: Splunk <HEC token> Content-Length: 1073 {"TIME":"2023-03-24 07:56:55.707","AUDIT": {"RECORDGMT":"2023-03-24:14:56:55.707636","GMTSEQNO":null,"RECORDLCT":"2023-03-24:07:56:55.707636","RECORDAUDITKEY":"","RECORDSESSIONKEY":"","SEQNO":null,"OUTCOME":4,"WARNINGMODE":"N","TESTMODE":"N","SEVERITY":"1","ALERTED":"A","PRODUCTCODE":"EMS","SUBJECT_USERNUMBER_MAJOR":null,"SUBJECT_USERNUMBER_MINOR":null,"TARGET_USERNUMBER_MAJOR":null,"TARGET_USERNUMBER_MINOR":null,"SUBJECTLOGIN":"","SUBJECTSYSTEM":"\\GALAXY","TARGETLOGIN":"","OBJECTTYPE":"COMFORTE.1.B00","OBJECTNAME":"","OPERATION":"EMS-EVENT","TERMINAL":"","MESSAGEID":2135,"MESSAGECODE":null,"RULENAME":"","USER_DATA":"REST alert","RESULT":"07:56 24MAR23 200,00,1268 Character test: 0242 (\\u00f2): >\uC3B2<"},"SESSION": {"RECORDSESSIONKEY":"","RECORDINSTALLKEY":"","SESSIONID":"\\GALAXY.$X98B:51790513","FOUNDSESSIONSTART":"N","FOUNDSESSIONEND":"N","SESSIONNAME":"","PROCESSTHREADID":"\\GALAXY.$X98B:51790513","PROCESSTHREADID2":"\\200.0,1268","CLIENTPROGRAM":"$Unknown.unknown.unknown","ANCESTORPROCESSTHREADID":"","IPADDRV46":"","DNSNAME":"","CLIENTCURRDIR":""}}
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