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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
 package org.apache.avro.ipc;
 import java.util.List;
An HTTP-based Transceiver implementation.
 public class HttpTransceiver extends Transceiver {
   static final String CONTENT_TYPE = "avro/binary"
   private URL url;
   public HttpTransceiver(URL url) { this. = url; }
   public String getRemoteName() { return this..toString(); }
   public synchronized List<ByteBuffertransceive(List<ByteBufferrequest)
     throws IOException {
     //"Connecting to: "+url);
     return super.transceive(request);
   public synchronized List<ByteBufferreadBuffers() throws IOException {
   public synchronized void writeBuffers(List<ByteBufferbuffers)
     throws IOException {
   static int getLength(List<ByteBufferbuffers) {
     int length = 0;
     for (ByteBuffer buffer : buffers) {
       length += 4;
       length += buffer.remaining();
     length += 4;
     return length;
     throws IOException {
     List<ByteBufferbuffers = new ArrayList<ByteBuffer>();
     while (true) {
       int length = (<<24)+(<<16)+(<<8);
       if (length == 0) {                       // end of buffers
         return buffers;
       ByteBuffer buffer = ByteBuffer.allocate(length);
       while (buffer.hasRemaining()) {
         int p = buffer.position();
         int i =, pbuffer.remaining());
         if (i < 0)
           throw new EOFException("Unexpected EOF");
   static void writeBuffers(List<ByteBufferbuffersOutputStream out)
     throws IOException {
     for (ByteBuffer buffer : buffers) {
       writeLength(buffer.limit(), out);           // length-prefix
       out.write(buffer.array(), buffer.position(), buffer.remaining());
    writeLength(0, out);                          // null-terminate
  private static void writeLength(int lengthOutputStream out)
    throws IOException {
    out.write(0xff & (length >>> 24));
    out.write(0xff & (length >>> 16));
    out.write(0xff & (length >>> 8));
    out.write(0xff & length);
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