rest.cpp: change HTTP_INTERNAL_SERVER_ERROR to HTTP_BAD_REQUEST

doc/release-notes.md

@@ -59,6 +59,10 @@ git merge commit are mentioned.
 
 ### RPC and REST
 
+UTXO set query (`GET /rest/getutxos/<checkmempool>/<txid>-<n>/<txid>-<n>/.../<txid>-<n>.<bin|hex|json>`) responses
+were changed to return status code HTTP_BAD_REQUEST (400) instead of HTTP_INTERNAL_SERVER_ERROR (500) when requests
+contain invalid parameters.
+
 ### Configuration and command-line options
 
 ### Block and transaction handling

qa/rpc-tests/rest.py

@@ -179,14 +179,14 @@ class RESTTest (BitcoinTestFramework):
         #do some invalid requests
         json_request = '{"checkmempool'
         response = http_post_call(url.hostname, url.port, '/rest/getutxos'+self.FORMAT_SEPARATOR+'json', json_request, True)
-        assert_equal(response.status, 500) #must be a 500 because we send a invalid json request
+        assert_equal(response.status, 400) #must be a 400 because we send a invalid json request
 
         json_request = '{"checkmempool'
         response = http_post_call(url.hostname, url.port, '/rest/getutxos'+self.FORMAT_SEPARATOR+'bin', json_request, True)
-        assert_equal(response.status, 500) #must be a 500 because we send a invalid bin request
+        assert_equal(response.status, 400) #must be a 400 because we send a invalid bin request
 
         response = http_post_call(url.hostname, url.port, '/rest/getutxos/checkmempool'+self.FORMAT_SEPARATOR+'bin', '', True)
-        assert_equal(response.status, 500) #must be a 500 because we send a invalid bin request
+        assert_equal(response.status, 400) #must be a 400 because we send a invalid bin request
 
         #test limits
         json_request = '/checkmempool/'
@@ -194,14 +194,14 @@ class RESTTest (BitcoinTestFramework):
             json_request += txid+'-'+str(n)+'/'
         json_request = json_request.rstrip("/")
         response = http_post_call(url.hostname, url.port, '/rest/getutxos'+json_request+self.FORMAT_SEPARATOR+'json', '', True)
-        assert_equal(response.status, 500) #must be a 500 because we exceeding the limits
+        assert_equal(response.status, 400) #must be a 400 because we exceeding the limits
 
         json_request = '/checkmempool/'
         for x in range(0, 15):
             json_request += txid+'-'+str(n)+'/'
         json_request = json_request.rstrip("/")
         response = http_post_call(url.hostname, url.port, '/rest/getutxos'+json_request+self.FORMAT_SEPARATOR+'json', '', True)
-        assert_equal(response.status, 200) #must be a 500 because we exceeding the limits
+        assert_equal(response.status, 200) #must be a 200 because we are within the limits
 
         self.nodes[0].generate(1) #generate block to not affect upcoming tests
         self.sync_all()

src/rest.cpp

@@ -420,7 +420,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
     // throw exception in case of a empty request
     std::string strRequestMutable = req->ReadBody();
     if (strRequestMutable.length() == 0 && uriParts.size() == 0)
-        return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Error: empty request");
+        return RESTERR(req, HTTP_BAD_REQUEST, "Error: empty request");
 
     bool fInputParsed = false;
     bool fCheckMemPool = false;
@@ -444,7 +444,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
             std::string strOutput = uriParts[i].substr(uriParts[i].find("-")+1);
 
             if (!ParseInt32(strOutput, &nOutput) || !IsHex(strTxid))
-                return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Parse error");
+                return RESTERR(req, HTTP_BAD_REQUEST, "Parse error");
 
             txid.SetHex(strTxid);
             vOutPoints.push_back(COutPoint(txid, (uint32_t)nOutput));
@@ -453,7 +453,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
         if (vOutPoints.size() > 0)
             fInputParsed = true;
         else
-            return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Error: empty request");
+            return RESTERR(req, HTTP_BAD_REQUEST, "Error: empty request");
     }
 
     switch (rf) {
@@ -469,7 +469,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
             if (strRequestMutable.size() > 0)
             {
                 if (fInputParsed) //don't allow sending input over URI and HTTP RAW DATA
-                    return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Combination of URI scheme inputs and raw post data is not allowed");
+                    return RESTERR(req, HTTP_BAD_REQUEST, "Combination of URI scheme inputs and raw post data is not allowed");
 
                 CDataStream oss(SER_NETWORK, PROTOCOL_VERSION);
                 oss << strRequestMutable;
@@ -478,14 +478,14 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
             }
         } catch (const std::ios_base::failure& e) {
             // abort in case of unreadable binary data
-            return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Parse error");
+            return RESTERR(req, HTTP_BAD_REQUEST, "Parse error");
         }
         break;
     }
 
     case RF_JSON: {
         if (!fInputParsed)
-            return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, "Error: empty request");
+            return RESTERR(req, HTTP_BAD_REQUEST, "Error: empty request");
         break;
     }
     default: {
@@ -495,7 +495,7 @@ static bool rest_getutxos(HTTPRequest* req, const std::string& strURIPart)
 
     // limit max outpoints
     if (vOutPoints.size() > MAX_GETUTXOS_OUTPOINTS)
-        return RESTERR(req, HTTP_INTERNAL_SERVER_ERROR, strprintf("Error: max outpoints exceeded (max: %d, tried: %d)", MAX_GETUTXOS_OUTPOINTS, vOutPoints.size()));
+        return RESTERR(req, HTTP_BAD_REQUEST, strprintf("Error: max outpoints exceeded (max: %d, tried: %d)", MAX_GETUTXOS_OUTPOINTS, vOutPoints.size()));
 
     // check spentness and form a bitmap (as well as a JSON capable human-readable string representation)
     vector<unsigned char> bitmap;