diff --git a/convex-core/src/main/java/convex/core/ErrorCodes.java b/convex-core/src/main/java/convex/core/ErrorCodes.java
index 6c1a1b88a..ebd47de25 100644
--- a/convex-core/src/main/java/convex/core/ErrorCodes.java
+++ b/convex-core/src/main/java/convex/core/ErrorCodes.java
@@ -238,5 +238,10 @@ public class ErrorCodes {
 	 */
 	public static final Keyword MISSING = Keyword.intern("MISSING");
 
+	/**
+	 * Error code indicating a resource limit exceeded
+	 */
+	public static final Keyword LIMIT = Keyword.intern("LIMIT");
+
 
 }
diff --git a/convex-core/src/main/java/convex/core/Result.java b/convex-core/src/main/java/convex/core/Result.java
index af35836f7..b04a57a02 100644
--- a/convex-core/src/main/java/convex/core/Result.java
+++ b/convex-core/src/main/java/convex/core/Result.java
@@ -68,6 +68,11 @@ private Result(AVector<ACell> values) {
 		super(RESULT_FORMAT, values);
 	}
 	
+	/**
+	 * Build a Result from a vector. WARNING: does not validate values
+	 * @param values
+	 * @return
+	 */
 	public static Result buildFromVector(AVector<ACell> values) {
 		return new Result(values);
 	}
@@ -466,6 +471,12 @@ public HashMap<String, Object> toJSON() {
 		return hm;
 	}
 
+	/**
+	 * Construct a result from a cell of data
+	 * @param data Result or Map including Result fields
+	 * @return Result value
+	 * @throws IllegalArgumentException if data is of incorrect type
+	 */
 	public static Result fromData(ACell data) {
 		if (data instanceof Result) {
 			return (Result) data;
diff --git a/convex-core/src/main/java/convex/core/SourceCodes.java b/convex-core/src/main/java/convex/core/SourceCodes.java
index 3b2edc8cd..d2da2839e 100644
--- a/convex-core/src/main/java/convex/core/SourceCodes.java
+++ b/convex-core/src/main/java/convex/core/SourceCodes.java
@@ -20,6 +20,11 @@ public class SourceCodes {
 	 */
 	public static final Keyword COMM = Keyword.intern("COMM");
 	
+	/**
+	 * Source code indicating an error at the server side (e.g. REST Server)
+	 */
+	public static final Keyword SERVER = Keyword.intern("SERVER");
+
 	/**
 	 * Source code indicating a failure during peer handling
 	 */
@@ -43,4 +48,5 @@ public class SourceCodes {
 
 
 
+
 }
diff --git a/convex-core/src/main/java/convex/core/data/Strings.java b/convex-core/src/main/java/convex/core/data/Strings.java
index 313e27ccd..292bb9c37 100644
--- a/convex-core/src/main/java/convex/core/data/Strings.java
+++ b/convex-core/src/main/java/convex/core/data/Strings.java
@@ -60,6 +60,8 @@ public class Strings {
 
 	public static final StringShort OLD_SEQUENCE = StringShort.create("Old sequence number");
 
+	public static final StringShort PRINT_EXCEEDED = StringShort.create(Constants.PRINT_EXCEEDED_STRING);
+
 
 	/**
 	 * Reads a String from a Blob encoding.
diff --git a/convex-java/src/main/java/convex/java/ConvexHTTP.java b/convex-java/src/main/java/convex/java/ConvexHTTP.java
index 4267f28ca..59c1e1d46 100644
--- a/convex-java/src/main/java/convex/java/ConvexHTTP.java
+++ b/convex-java/src/main/java/convex/java/ConvexHTTP.java
@@ -82,7 +82,8 @@ public CompletableFuture<Result> query(ACell form, Address address) {
 		CompletableFuture<Result> result=future.thenApply(response->{
 			String body=response.getBodyText();
 			try {
-				System.out.println(body);
+				// System.out.println(body);
+				// We expect a map containing the result fields
 				ACell data=Reader.read(body);
 				return Result.fromData(data);
 			} catch (ParseException e) {
diff --git a/convex-restapi/src/main/java/convex/restapi/api/ChainAPI.java b/convex-restapi/src/main/java/convex/restapi/api/ChainAPI.java
index 5c2829312..ca0e6a19a 100644
--- a/convex-restapi/src/main/java/convex/restapi/api/ChainAPI.java
+++ b/convex-restapi/src/main/java/convex/restapi/api/ChainAPI.java
@@ -13,12 +13,14 @@
 import convex.core.Coin;
 import convex.core.ErrorCodes;
 import convex.core.Result;
+import convex.core.SourceCodes;
 import convex.core.crypto.AKeyPair;
 import convex.core.crypto.ASignature;
 import convex.core.crypto.Ed25519Signature;
 import convex.core.data.ABlob;
 import convex.core.data.ACell;
 import convex.core.data.AMap;
+import convex.core.data.AString;
 import convex.core.data.AccountKey;
 import convex.core.data.AccountStatus;
 import convex.core.data.Address;
@@ -33,6 +35,7 @@
 import convex.core.data.PeerStatus;
 import convex.core.data.Ref;
 import convex.core.data.SignedData;
+import convex.core.data.Strings;
 import convex.core.data.prim.AInteger;
 import convex.core.data.prim.CVMLong;
 import convex.core.exceptions.BadFormatException;
@@ -651,8 +654,6 @@ public void runQuery(Context ctx) throws InterruptedException {
 		} else {
 			Map<String, Object> req = getJSONBody(ctx);
 			addr = Address.parse(req.get("address"));
-			if (addr == null)
-				throw new BadRequestResponse("query requires an 'address' field.");
 			Object srcValue = req.get("source");
 			form = readCode(srcValue);
 		}
@@ -662,35 +663,43 @@ public void runQuery(Context ctx) throws InterruptedException {
 	}
 
 	private void prepareResult(Context ctx, Result r) {
+		if (r.getSource()==null) {
+			r=r.withSource(SourceCodes.SERVER);
+		}
+		
 		ctx.status(r.isError()?422:200);
 		Enumeration<String> accepts=ctx.req().getHeaders("Accept");
-		String accept=ContentTypes.JSON;
+		String type=ContentTypes.JSON;
 		if (accepts!=null) {
 			for (String a:Collections.list(accepts)) {
 				if (a.contains(ContentTypes.CVX_RAW)) {
-					accept=ContentTypes.CVX_RAW;
+					type=ContentTypes.CVX_RAW;
 					break;
 				}
 				if (a.contains(ContentTypes.CVX)) {
-					accept=ContentTypes.CVX;
+					type=ContentTypes.CVX;
 				}
 			}
 		}
 		
-		if (accept.equals(ContentTypes.JSON)) {
+		if (type.equals(ContentTypes.JSON)) {
 			ctx.contentType(ContentTypes.JSON);
 			HashMap<String, Object> resultJSON = r.toJSON();
 			ctx.result(JSON.toPrettyString(resultJSON));
-		} else if (accept.equals(ContentTypes.CVX)) {
+		} else if (type.equals(ContentTypes.CVX)) {
 			ctx.contentType(ContentTypes.CVX);
-			ctx.result(RT.print(r).toString());
-		} else if (accept.equals(ContentTypes.CVX_RAW)) {
+			AString rs=RT.print(r);
+			if (rs==null) {
+				rs=RT.print(Result.error(ErrorCodes.LIMIT, Strings.PRINT_EXCEEDED).withSource(SourceCodes.PEER));
+			}
+			ctx.result(rs.toString());
+		} else if (type.equals(ContentTypes.CVX_RAW)) {
 			ctx.contentType(ContentTypes.CVX_RAW);
 			ctx.result(Format.encodeMultiCell(r, true).getBytes());
 		} else {
 			ctx.contentType(ContentTypes.TEXT);
 			ctx.status(400);
-			ctx.result("Unsupported content type: "+accept);
+			ctx.result("Unsupported content type: "+type);
 		}
 	}
 
diff --git a/convex-restapi/src/test/java/convex/restapi/test/ConvexHTTPTest.java b/convex-restapi/src/test/java/convex/restapi/test/ConvexHTTPTest.java
index 8d446785f..162ccd6d7 100644
--- a/convex-restapi/src/test/java/convex/restapi/test/ConvexHTTPTest.java
+++ b/convex-restapi/src/test/java/convex/restapi/test/ConvexHTTPTest.java
@@ -2,13 +2,18 @@
 
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 
 import java.net.URI;
 import java.net.URISyntaxException;
 
+import convex.core.Result;
+import convex.core.data.prim.CVMLong;
 import convex.core.exceptions.ResultException;
 import convex.core.init.Init;
+import convex.core.lang.Reader;
 import convex.core.util.Utils;
 import convex.java.ConvexHTTP;
 
@@ -24,9 +29,13 @@ private ConvexHTTP connect() {
 		}
 	}
 	
-	@Test public void testQuery() throws ResultException {
+	@Test public void testQuery() throws ResultException, InterruptedException {
 		ConvexHTTP convex=connect();
 		Long l=convex.getBalance();
 		assertNotNull(l);
+		
+		Result r=convex.querySync(Reader.read("(+ 2 3)"), null);
+		assertFalse(r.isError());
+		assertEquals(CVMLong.create(5),r.getValue());
 	}
 }