See #115 for pull request.

If no parameters are present after creating request, do not append ? to URI
I have noticed that the ? is always present at the end of URIs. This is completely valid, I suspect, but it was unexpected when I was making some Robolectric unit tests to check if the thing was sending the information to the correct URI. Perhaps, if the parameters are empty (as in there are no parameters to be appended) don't add the ? query parameters separator.

retrofit/src/main/java/retrofit/http/HttpMethodType.java
retrofit/src/main/java/retrofit/http/HttpMethodType.java
retrofit/src/test/java/retrofit/http/RestAdapterTest.java
diff --git a/retrofit/src/main/java/retrofit/http/HttpMethodType.java b/retrofit/src/main/java/retrofit/http/HttpMethodType.java
index d1a58e973a..fc981b49b8 100644
--- a/retrofit/src/main/java/retrofit/http/HttpMethodType.java
+++ b/retrofit/src/main/java/retrofit/http/HttpMethodType.java
@@ -84,6 +84,9 @@ private static URI getUri(HttpRequestBuilder builder) throws URISyntaxException
   private static URI getParameterizedUri(HttpRequestBuilder builder) throws URISyntaxException {
     List<NameValuePair> queryParams = builder.getParamList(false);
     String queryString = URLEncodedUtils.format(queryParams, HTTP.UTF_8);
+    if (queryString != null && queryString.length() == 0) {
+      queryString = null;
+    }
     return URIUtils.createURI(builder.getScheme(), builder.getHost(), -1, builder.getRelativePath(), queryString, null);
   }
 

diff --git a/retrofit/src/test/java/retrofit/http/RestAdapterTest.java b/retrofit/src/test/java/retrofit/http/RestAdapterTest.java
index 87552a85ac..d7ead7d0ad 100644
--- a/retrofit/src/test/java/retrofit/http/RestAdapterTest.java
+++ b/retrofit/src/test/java/retrofit/http/RestAdapterTest.java
@@ -49,7 +49,8 @@ public class RestAdapterTest {
   private static final String ENTITY_PATH_PARAM = "entity/{id}";
   private static final String BASE_URL = "http://host/api/entity";
   private static final String PATH_URL_PREFIX = BASE_URL + "/";
-  private static final String GET_DELETE_SIMPLE_URL = BASE_URL + "?";
+  private static final String GET_DELETE_SIMPLE_URL = BASE_URL;
+  private static final String GET_DELETE_SIMPLE_URL_WITH_PARAMS = GET_DELETE_SIMPLE_URL + "?";
   private static final Gson GSON = new Gson();
   private static final Response RESPONSE = new Response("some text");
   private static final ServerError SERVER_ERROR = new ServerError("danger, danger!");
@@ -99,7 +100,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeleteParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL + "id=" + ID);
+    expectAsyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "id=" + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -108,7 +109,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeleteParamSync() throws IOException {
-    expectSyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL + "id=" + ID);
+    expectSyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "id=" + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -118,7 +119,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeleteWithFixedParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL + "filter=merchant&id=" + ID);
+    expectAsyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&id=" + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -127,7 +128,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeleteWithFixedParamSync() throws IOException {
-    expectSyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL + "filter=merchant&id=" + ID);
+    expectSyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&id=" + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -137,7 +138,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeleteWithMultipleFixedParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL + "filter=merchant&name2=value2&" + "id=" + ID);
+    expectAsyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&name2=value2&" + "id=" + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -146,7 +147,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeleteWithMultipleFixedParamSync() throws IOException {
-    expectSyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL + "filter=merchant&name2=value2&" + "id=" + ID);
+    expectSyncLifecycle(HttpDelete.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&name2=value2&" + "id=" + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -156,7 +157,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeletePathParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpDelete.class, PATH_URL_PREFIX + ID + "?");
+    expectAsyncLifecycle(HttpDelete.class, PATH_URL_PREFIX + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -165,7 +166,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceDeletePathParamSync() throws IOException {
-    expectSyncLifecycle(HttpDelete.class, PATH_URL_PREFIX + ID + "?");
+    expectSyncLifecycle(HttpDelete.class, PATH_URL_PREFIX + ID);
     replayAll();
 
     DeleteService service = restAdapter.create(DeleteService.class);
@@ -194,7 +195,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL + "id=" + ID);
+    expectAsyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "id=" + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -203,7 +204,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetParamSync() throws IOException {
-    expectSyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL + "id=" + ID);
+    expectSyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "id=" + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -213,7 +214,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetWithFixedParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL + "filter=merchant&id=" + ID);
+    expectAsyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&id=" + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -222,7 +223,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetWithFixedParamSync() throws IOException {
-    expectSyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL + "filter=merchant&id=" + ID);
+    expectSyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&id=" + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -232,7 +233,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetWithMultipleFixedParamsAsync() throws IOException {
-    expectAsyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL + "filter=merchant&name2=value2&id=" + ID);
+    expectAsyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&name2=value2&id=" + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -241,7 +242,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetWithMultipleFixedParamsSync() throws IOException {
-    expectSyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL + "filter=merchant&name2=value2&id=" + ID);
+    expectSyncLifecycle(HttpGet.class, GET_DELETE_SIMPLE_URL_WITH_PARAMS + "filter=merchant&name2=value2&id=" + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -251,7 +252,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetPathParamAsync() throws IOException {
-    expectAsyncLifecycle(HttpGet.class, PATH_URL_PREFIX + ID + "?");
+    expectAsyncLifecycle(HttpGet.class, PATH_URL_PREFIX + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
@@ -260,7 +261,7 @@ public class RestAdapterTest {
   }
 
   @Test public void testServiceGetPathParamSync() throws IOException {
-    expectSyncLifecycle(HttpGet.class, PATH_URL_PREFIX + ID + "?");
+    expectSyncLifecycle(HttpGet.class, PATH_URL_PREFIX + ID);
     replayAll();
 
     GetService service = restAdapter.create(GetService.class);
