Update README.md.

README.md

@@ -185,7 +185,9 @@ public void updateItem(
 ) throws SQLException { ... }
 ```
 
-Like path parameters, body parameters are implicitly required. By default, content is assumed to be JSON and is automatically [converted](#type-coercion) to the specified type. However, subclasses can override the `decodeBody()` method to perform custom conversions.
+Like path parameters, body parameters are implicitly required. If a handler method declares any query parameters, a body parameter must also be declared. A body parameter of type `Void` may be used to indicate that the handler either does not accept a body or will process the input stream directly, as discussed [below](#request-and-repsonse-properties).
+
+By default, content is assumed to be JSON and is automatically [converted](#type-coercion) to the specified type. Subclasses can override the `decodeBody()` method to perform custom conversions.
 
 ### Return Values
 Return values are converted to JSON as follows:
@@ -221,7 +223,7 @@ protected HttpServletRequest getRequest() { ... }
 protected HttpServletResponse getResponse() { ... }
 ```
 
-For example, a service might use the request to get the name of the current user, or use the response to return a custom header.
+For example, a service might use the request to read directly from the input stream, or use the response to return a custom header.
 
 The response object can also be used to produce a custom result. If a service method commits the response by writing to the output stream, the method's return value (if any) will be ignored by `WebService`. This allows a service to return content that cannot be easily represented as JSON, such as image data.
 
@@ -373,7 +375,7 @@ public interface ResponseHandler<T> {
 }
 ```
 
-If a service returns an error response, the default error handler will throw a `WebServiceException` (a subclass of `IOException`). If the type of the error response is "text/plain", the deserialized response body will be provided in the exception message. 
+If an operation does not complete successfully, the default error handler will throw a `WebServiceException` (a subclass of `IOException`). If the type of the error response is "text/plain", the response content will be provided in the exception message. 
 
 A custom error handler can be supplied via `setErrorHandler()`:
 

kilo-server/src/main/java/org/httprpc/kilo/WebService.java

@@ -1117,11 +1117,20 @@ private Object[] getArguments(Parameter[] parameters, List<String> keys, Map<Str
         }
 
         if (n < parameters.length) {
-            try {
-                arguments[n] = decodeBody(request, parameters[n].getType());
-            } catch (IOException exception) {
-                throw new UnsupportedOperationException(exception);
+            var type = parameters[n].getType();
+
+            Object body;
+            if (type == Void.class) {
+                body = null;
+            } else {
+                try {
+                    body = decodeBody(request, parameters[n].getType());
+                } catch (IOException exception) {
+                    throw new UnsupportedOperationException(exception);
+                }
             }
+
+            arguments[n] = body;
         }
 
         return arguments;

kilo-test/src/main/java/org/httprpc/kilo/test/BulkUploadService.java

@@ -15,15 +15,13 @@
 package org.httprpc.kilo.test;
 
 import jakarta.servlet.annotation.WebServlet;
-import jakarta.servlet.http.HttpServletRequest;
 import org.httprpc.kilo.RequestMethod;
 import org.httprpc.kilo.ResourcePath;
 import org.httprpc.kilo.beans.BeanAdapter;
 import org.httprpc.kilo.io.CSVDecoder;
 import org.httprpc.kilo.sql.QueryBuilder;
 
 import java.io.IOException;
-import java.lang.reflect.Type;
 import java.sql.SQLException;
 
 @WebServlet(urlPatterns = {"/bulk-upload/*"}, loadOnStartup = 1)
@@ -38,11 +36,6 @@ public interface Row {
 
     private static final int BATCH_SIZE = 25000;
 
-    @Override
-    protected Object decodeBody(HttpServletRequest request, Type type) {
-        return null;
-    }
-
     @RequestMethod("POST")
     @ResourcePath("upload")
     public void upload(Void body) throws SQLException, IOException {

kilo-test/src/main/java/org/httprpc/kilo/test/TestService.java

@@ -16,7 +16,6 @@
 
 import jakarta.servlet.annotation.MultipartConfig;
 import jakarta.servlet.annotation.WebServlet;
-import jakarta.servlet.http.HttpServletRequest;
 import org.httprpc.kilo.Creates;
 import org.httprpc.kilo.Description;
 import org.httprpc.kilo.Name;
@@ -26,7 +25,6 @@
 import org.httprpc.kilo.beans.BeanAdapter;
 
 import java.io.IOException;
-import java.lang.reflect.Type;
 import java.math.BigInteger;
 import java.net.URL;
 import java.time.DayOfWeek;
@@ -176,17 +174,6 @@ public BigInteger next() {
         }
     }
 
-    @Override
-    protected Object decodeBody(HttpServletRequest request, Type type) throws IOException {
-        var contentType = request.getContentType();
-
-        if (contentType != null && contentType.equals("application/octet-stream")) {
-            return null;
-        } else {
-            return super.decodeBody(request, type);
-        }
-    }
-
     @RequestMethod("GET")
     public Map<String, Object> testGet(@Required String string, List<String> strings,
         Integer number, Set<Integer> numbers, boolean flag, char character, DayOfWeek dayOfWeek,