diff --git a/cpu-miner.c b/cpu-miner.c
index f9e1139..7c4fc32 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -207,8 +207,6 @@ static struct option options[] = {
 
 struct work {
 	unsigned char	data[128];
-	unsigned char	hash1[64];
-	unsigned char	midstate[32];
 	unsigned char	target[32];
 
 	unsigned char	hash[32];
@@ -242,22 +240,10 @@ static bool jobj_binary(const json_t *obj, const char *key,
 
 static bool work_decode(const json_t *val, struct work *work)
 {
-	if (unlikely(!jobj_binary(val, "midstate",
-			 work->midstate, sizeof(work->midstate)))) {
-		applog(LOG_ERR, "JSON inval midstate");
-		goto err_out;
-	}
-
 	if (unlikely(!jobj_binary(val, "data", work->data, sizeof(work->data)))) {
 		applog(LOG_ERR, "JSON inval data");
 		goto err_out;
 	}
-
-	if (unlikely(!jobj_binary(val, "hash1", work->hash1, sizeof(work->hash1)))) {
-		applog(LOG_ERR, "JSON inval hash1");
-		goto err_out;
-	}
-
 	if (unlikely(!jobj_binary(val, "target", work->target, sizeof(work->target)))) {
 		applog(LOG_ERR, "JSON inval target");
 		goto err_out;
diff --git a/util.c b/util.c
index 3806c4a..609bf8a 100644
--- a/util.c
+++ b/util.c
@@ -213,7 +213,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 	struct upload_buffer upload_data;
 	json_error_t err = { };
 	struct curl_slist *headers = NULL;
-	char len_hdr[64], user_agent_hdr[128];
+	char len_hdr[64];
 	char curl_err_str[CURL_ERROR_SIZE];
 	long timeout = opt_timeout;
 	struct header_info hi = { };
@@ -255,12 +255,14 @@ json_t *json_rpc_call(CURL *curl, const char *url,
 	upload_data.len = strlen(rpc_req);
 	sprintf(len_hdr, "Content-Length: %lu",
 		(unsigned long) upload_data.len);
-	sprintf(user_agent_hdr, "User-Agent: %s", PACKAGE_STRING);
 
 	headers = curl_slist_append(headers,
-		"Content-type: application/json");
+		"Content-Type: application/json");
 	headers = curl_slist_append(headers, len_hdr);
-	headers = curl_slist_append(headers, user_agent_hdr);
+	headers = curl_slist_append(headers, "User-Agent: " PACKAGE_STRING);
+	headers = curl_slist_append(headers,
+		"X-Mining-Extensions: midstate");
+	headers = curl_slist_append(headers, "Accept:"); /* disable Accept hdr*/
 	headers = curl_slist_append(headers, "Expect:"); /* disable Expect hdr*/
 
 	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);