diff --git a/src/rest.cpp b/src/rest.cpp
index 940526706..226e237fc 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -71,15 +71,24 @@ static bool RESTERR(HTTPRequest* req, enum HTTPStatusCode status, string message
     return false;
 }
 
-static enum RetFormat ParseDataFormat(vector<string>& params, const string& strReq)
+static enum RetFormat ParseDataFormat(std::string& param, const std::string& strReq)
 {
-    boost::split(params, strReq, boost::is_any_of("."));
-    if (params.size() > 1) {
-        for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
-            if (params[1] == rf_names[i].name)
-                return rf_names[i].rf;
+    const std::string::size_type pos = strReq.rfind('.');
+    if (pos == std::string::npos)
+    {
+        param = strReq;
+        return rf_names[0].rf;
     }
 
+    param = strReq.substr(0, pos);
+    const std::string suff(strReq, pos + 1);
+
+    for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
+        if (suff == rf_names[i].name)
+            return rf_names[i].rf;
+
+    /* If no suffix is found, return original string.  */
+    param = strReq;
     return rf_names[0].rf;
 }
 
@@ -121,10 +130,10 @@ static bool rest_headers(HTTPRequest* req,
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    const RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string param;
+    const RetFormat rf = ParseDataFormat(param, strURIPart);
     vector<string> path;
-    boost::split(path, params[0], boost::is_any_of("/"));
+    boost::split(path, param, boost::is_any_of("/"));
 
     if (path.size() != 2)
         return RESTERR(req, HTTP_BAD_REQUEST, "No header count specified. Use /rest/headers/<count>/<hash>.<ext>.");
@@ -196,10 +205,9 @@ static bool rest_block(HTTPRequest* req,
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    const RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string hashStr;
+    const RetFormat rf = ParseDataFormat(hashStr, strURIPart);
 
-    string hashStr = params[0];
     uint256 hash;
     if (!ParseHashStr(hashStr, hash))
         return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
@@ -268,8 +276,8 @@ static bool rest_chaininfo(HTTPRequest* req, const std::string& strURIPart)
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    const RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string param;
+    const RetFormat rf = ParseDataFormat(param, strURIPart);
 
     switch (rf) {
     case RF_JSON: {
@@ -293,8 +301,8 @@ static bool rest_mempool_info(HTTPRequest* req, const std::string& strURIPart)
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    const RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string param;
+    const RetFormat rf = ParseDataFormat(param, strURIPart);
 
     switch (rf) {
     case RF_JSON: {
@@ -318,8 +326,8 @@ static bool rest_mempool_contents(HTTPRequest* req, const std::string& strURIPar
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    const RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string param;
+    const RetFormat rf = ParseDataFormat(param, strURIPart);
 
     switch (rf) {
     case RF_JSON: {
@@ -343,10 +351,9 @@ static bool rest_tx(HTTPRequest* req, const std::string& strURIPart)
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    const RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string hashStr;
+    const RetFormat rf = ParseDataFormat(hashStr, strURIPart);
 
-    string hashStr = params[0];
     uint256 hash;
     if (!ParseHashStr(hashStr, hash))
         return RESTERR(req, HTTP_BAD_REQUEST, "Invalid hash: " + hashStr);
@@ -396,13 +403,13 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
 {
     if (!CheckWarmup(req))
         return false;
-    vector<string> params;
-    enum RetFormat rf = ParseDataFormat(params, strURIPart);
+    std::string param;
+    const RetFormat rf = ParseDataFormat(param, strURIPart);
 
     vector<string> uriParts;
-    if (params.size() > 0 && params[0].length() > 1)
+    if (param.length() > 1)
     {
-        std::string strUriParams = params[0].substr(1);
+        std::string strUriParams = param.substr(1);
         boost::split(uriParts, strUriParams, boost::is_any_of("/"));
     }