diff --git a/fcrepo-http-api/src/main/java/org/fcrepo/http/api/FedoraNodes.java b/fcrepo-http-api/src/main/java/org/fcrepo/http/api/FedoraNodes.java
index efbc447fe3..fe3eac08f5 100644
--- a/fcrepo-http-api/src/main/java/org/fcrepo/http/api/FedoraNodes.java
+++ b/fcrepo-http-api/src/main/java/org/fcrepo/http/api/FedoraNodes.java
@@ -394,7 +394,7 @@ public Response updateSparql(@PathParam("path")
     }
 
     /**
-     * Replace triples with triples from a new model
+     * Create a resource at a specified path, or replace triples with provided RDF.
      * @param pathList
      * @param uriInfo
      * @param requestContentType
@@ -411,8 +411,7 @@ public Response createOrReplaceObjectRdf(
             @HeaderParam("Content-Type")
             final MediaType requestContentType,
             final InputStream requestBodyStream,
-            @Context
-            final Request request,
+            @Context final Request request,
             @Context final HttpServletResponse servletResponse) throws RepositoryException, ParseException,
             IOException, InvalidChecksumException, URISyntaxException {
         final String path = toPath(pathList);
@@ -425,9 +424,11 @@ public Response createOrReplaceObjectRdf(
 
             final MediaType contentType = getSimpleContentType(requestContentType);
 
+            final boolean preexisting;
             if (nodeService.exists(session, path)) {
                 resource = nodeService.getObject(session, path);
                 response = noContent();
+                preexisting = true;
             } else {
                 final MediaType effectiveContentType
                     = requestBodyStream == null || requestContentType == null ? null : contentType;
@@ -438,6 +439,7 @@ public Response createOrReplaceObjectRdf(
                 final URI location = new URI(idTranslator.getSubject(resource.getNode().getPath()).getURI());
 
                 response = created(location).entity(location.toString());
+                preexisting = false;
             }
 
             evaluateRequestPreconditions(request, resource);
@@ -455,6 +457,8 @@ public Response createOrReplaceObjectRdf(
 
                 resource.replaceProperties(graphSubjects, inputModel);
 
+            } else if (preexisting) {
+                return status(SC_CONFLICT).entity("No RDF provided and the resource already exists!").build();
             }
 
             session.save();
@@ -767,8 +771,11 @@ public Response copyObject(@PathParam("path") final List<PathSegment> path,
 
             if (destination == null) {
                 return status(SC_BAD_GATEWAY).entity("Destination was not a valid resource path").build();
+            } else if (nodeService.exists(session, destination)) {
+                return status(SC_PRECONDITION_FAILED).entity("Destination resource already exists").build();
             }
 
+
             nodeService.copyObject(session, toPath(path), destination);
             session.save();
             versionService.nodeUpdated(session, destination);
@@ -819,6 +826,8 @@ public Response moveObject(@PathParam("path") final List<PathSegment> pathList,
 
             if (destination == null) {
                 return status(SC_BAD_GATEWAY).entity("Destination was not a valid resource path").build();
+            } else if (nodeService.exists(session, destination)) {
+                return status(SC_PRECONDITION_FAILED).entity("Destination resource already exists").build();
             }
 
             nodeService.moveObject(session, path, destination);
diff --git a/fcrepo-http-api/src/test/java/org/fcrepo/integration/http/api/FedoraNodesIT.java b/fcrepo-http-api/src/test/java/org/fcrepo/integration/http/api/FedoraNodesIT.java
index 01c67584f9..fd97919581 100644
--- a/fcrepo-http-api/src/test/java/org/fcrepo/integration/http/api/FedoraNodesIT.java
+++ b/fcrepo-http-api/src/test/java/org/fcrepo/integration/http/api/FedoraNodesIT.java
@@ -37,6 +37,7 @@
 import static javax.ws.rs.core.Response.Status.NOT_MODIFIED;
 import static javax.ws.rs.core.Response.Status.NO_CONTENT;
 import static javax.ws.rs.core.Response.Status.OK;
+import static javax.ws.rs.core.Response.Status.PRECONDITION_FAILED;
 import static nu.validator.htmlparser.common.DoctypeExpectation.NO_DOCTYPE_ERRORS;
 import static nu.validator.htmlparser.common.XmlViolationPolicy.ALLOW;
 import static org.apache.http.impl.client.cache.CacheConfig.DEFAULT;
@@ -213,6 +214,17 @@ public void testIngestWithSlug() throws Exception {
                 getStatus(new HttpGet(location)));
     }
 
+    @Test
+    public void testIngestWithRepeatedSlug() throws Exception {
+        final String pid = getRandomUniquePid();
+        final HttpPut put = new HttpPut(serverAddress + pid);
+        assertEquals(201, getStatus(put));
+
+        final HttpPost method = postObjMethod("");
+        method.addHeader("Slug", pid);
+        assertEquals(409, getStatus(method));
+    }
+
     @Test
     public void testIngestWithBinary() throws Exception {
         final HttpPost method = postObjMethod("");
@@ -739,6 +751,16 @@ public void testUpdateObjectGraphWithProblems() throws Exception {
 
     }
 
+    @Test
+    public void testRepeatedPut() throws Exception {
+        final String pid = getRandomUniquePid();
+        final HttpPut firstPut = new HttpPut(serverAddress + pid);
+        assertEquals(201, getStatus(firstPut));
+
+        final HttpPut secondPut = new HttpPut(serverAddress + pid);
+        assertEquals(409, getStatus(secondPut));
+    }
+
     @Test
     public void testFilteredLDPTypes() throws Exception {
         final String pid = getRandomUniquePid();
@@ -1049,6 +1071,21 @@ public void testCopy() throws Exception {
         assertEquals(OK.getStatusCode(), originalResult.getStatusLine().getStatusCode());
     }
 
+    @Test
+    public void testCopyDestExists() throws Exception {
+
+        final HttpResponse response1 = createObject("");
+        final String location1 = response1.getFirstHeader("Location").getValue();
+        final HttpResponse response2 = createObject("");
+        final String location2 = response2.getFirstHeader("Location").getValue();
+
+        final HttpCopy request = new HttpCopy(location1);
+        request.addHeader("Destination", location2);
+        final HttpResponse result = client.execute(request);
+
+        assertEquals(PRECONDITION_FAILED.getStatusCode(), result.getStatusLine().getStatusCode());
+    }
+
     @Test
     public void testMove() throws Exception {
 
@@ -1069,6 +1106,21 @@ public void testMove() throws Exception {
         assertEquals(NOT_FOUND.getStatusCode(), originalResult.getStatusLine().getStatusCode());
     }
 
+    @Test
+    public void testMoveDestExists() throws Exception {
+
+        final HttpResponse response1 = createObject("");
+        final String location1 = response1.getFirstHeader("Location").getValue();
+        final HttpResponse response2 = createObject("");
+        final String location2 = response2.getFirstHeader("Location").getValue();
+
+        final HttpMove request = new HttpMove(location1);
+        request.addHeader("Destination", location2);
+        final HttpResponse result = client.execute(request);
+
+        assertEquals(PRECONDITION_FAILED.getStatusCode(), result.getStatusLine().getStatusCode());
+    }
+
     @Test
     public void testMoveWithBadEtag() throws Exception {