diff --git a/src/main/java/dev/braintrust/config/BraintrustConfig.java b/src/main/java/dev/braintrust/config/BraintrustConfig.java
index 5c0a97e3..8eaf666f 100644
--- a/src/main/java/dev/braintrust/config/BraintrustConfig.java
+++ b/src/main/java/dev/braintrust/config/BraintrustConfig.java
@@ -96,14 +96,17 @@ URI fetchProjectURI(BraintrustApiClient client) {
         try {
             var orgAndProject = client.getProjectAndOrgInfo().orElseThrow();
             var baseURI = new URI(appUrl());
+            var path =
+                    "/app/%s/p/%s"
+                            .formatted(
+                                    orgAndProject.orgInfo().name(), orgAndProject.project().name());
             return new URI(
                     baseURI.getScheme(),
+                    baseURI.getUserInfo(),
                     baseURI.getHost(),
-                    baseURI.getPath()
-                            + "/app/"
-                            + orgAndProject.orgInfo().name()
-                            + "/p/"
-                            + orgAndProject.project().name(),
+                    baseURI.getPort(),
+                    path,
+                    null,
                     null);
         } catch (URISyntaxException e) {
             throw new RuntimeException(e);
diff --git a/src/main/java/dev/braintrust/trace/BraintrustLogExporter.java b/src/main/java/dev/braintrust/trace/BraintrustLogExporter.java
index cce5fdf7..559ecd73 100644
--- a/src/main/java/dev/braintrust/trace/BraintrustLogExporter.java
+++ b/src/main/java/dev/braintrust/trace/BraintrustLogExporter.java
@@ -85,9 +85,23 @@ private CompletableResultCode exportWithParent(String parent, List<LogRecordData
                                 return exporterBuilder.build();
                             });
 
-            log.debug("Exporting {} logs with x-bt-parent: {}", logs.size(), parent);
-            // Export the logs
-            return exporter.export(logs);
+            var result = exporter.export(logs);
+            // NOTE: whenComplete mutates the original object. does not copy.
+            return result.whenComplete(
+                    () -> {
+                        if (result.isSuccess()) {
+                            log.debug(
+                                    "Successfully exported {} logs with x-bt-parent: {}",
+                                    logs.size(),
+                                    parent);
+                        } else {
+                            log.warn(
+                                    "Failed to export {} spans to endpoint {}",
+                                    logs.size(),
+                                    logsEndpoint,
+                                    result.getFailureThrowable());
+                        }
+                    });
         } catch (Exception e) {
             log.error("Failed to export logs", e);
             return CompletableResultCode.ofFailure();
diff --git a/src/main/java/dev/braintrust/trace/BraintrustSpanExporter.java b/src/main/java/dev/braintrust/trace/BraintrustSpanExporter.java
index 97ea63f2..a38c245f 100644
--- a/src/main/java/dev/braintrust/trace/BraintrustSpanExporter.java
+++ b/src/main/java/dev/braintrust/trace/BraintrustSpanExporter.java
@@ -88,13 +88,28 @@ private CompletableResultCode exportWithParent(String parent, List<SpanData> spa
                                 return exporterBuilder.build();
                             });
 
-            log.debug("Exporting {} spans with x-bt-parent: {}", spans.size(), parent);
             if (config.exportSpansInMemoryForUnitTest()) {
                 SPANS_EXPORTED.putIfAbsent(parent, new CopyOnWriteArrayList<>());
                 SPANS_EXPORTED.get(parent).addAll(spans);
                 return CompletableResultCode.ofSuccess();
             } else {
-                return exporter.export(spans);
+                var result = exporter.export(spans);
+                // NOTE: whenComplete mutates the original object. does not copy.
+                return result.whenComplete(
+                        () -> {
+                            if (result.isSuccess()) {
+                                log.debug(
+                                        "Successfully exported {} spans with x-bt-parent: {}",
+                                        spans.size(),
+                                        parent);
+                            } else {
+                                log.warn(
+                                        "Failed to export {} spans to endpoint {}",
+                                        spans.size(),
+                                        tracesEndpoint,
+                                        result.getFailureThrowable());
+                            }
+                        });
             }
         } catch (Exception e) {
             log.error("Failed to export spans", e);
diff --git a/src/test/java/dev/braintrust/config/BraintrustConfigTest.java b/src/test/java/dev/braintrust/config/BraintrustConfigTest.java
index 52daef7f..945c7932 100644
--- a/src/test/java/dev/braintrust/config/BraintrustConfigTest.java
+++ b/src/test/java/dev/braintrust/config/BraintrustConfigTest.java
@@ -46,14 +46,27 @@ void projectUriFetching() {
                 new dev.braintrust.api.BraintrustApiClient.OrganizationAndProjectInfo(
                         orgInfo, project);
         var client = new dev.braintrust.api.BraintrustApiClient.InMemoryImpl(orgAndProjectInfo);
-        var config =
-                BraintrustConfig.of(
-                        "BRAINTRUST_API_KEY", "foobar",
-                        "BRAINTRUST_API_URL", "https://api.braintrust.dev",
-                        "BRAINTRUST_APP_URL", "https://braintrust.dev",
-                        "BRAINTRUST_DEFAULT_PROJECT_ID", projectId);
-        assertEquals(
-                "https://braintrust.dev/app/Test%20Org/p/some%20project",
-                config.fetchProjectURI(client).toASCIIString());
+        { // standard braintrust.dev
+            var config =
+                    BraintrustConfig.of(
+                            "BRAINTRUST_API_KEY", "foobar",
+                            "BRAINTRUST_API_URL", "https://api.braintrust.dev",
+                            "BRAINTRUST_APP_URL", "https://braintrust.dev",
+                            "BRAINTRUST_DEFAULT_PROJECT_ID", projectId);
+            assertEquals(
+                    "https://braintrust.dev/app/Test%20Org/p/some%20project",
+                    config.fetchProjectURI(client).toASCIIString());
+        }
+        { // self-hosted with a non-standard port
+            var config =
+                    BraintrustConfig.of(
+                            "BRAINTRUST_API_KEY", "foobar",
+                            "BRAINTRUST_API_URL", "http://someselfhost:8080",
+                            "BRAINTRUST_APP_URL", "http://someselfhost:3001",
+                            "BRAINTRUST_DEFAULT_PROJECT_ID", projectId);
+            assertEquals(
+                    "http://someselfhost:3001/app/Test%20Org/p/some%20project",
+                    config.fetchProjectURI(client).toASCIIString());
+        }
     }
 }