HttpComponents Client Source Code Files

HttpComponents Client Source Code Files are provided in the source package file,

You can download as described in the previous tutorial and go to the "httpclient5/src" sub-folder to view Source Code files.

You can also browse HttpComponents Client Source Code below:



 * ====================================================================
 * 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
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <>.

package org.apache.hc.client5.http.utils;

import org.apache.hc.core5.annotation.Internal;

public class Hex {

    private Hex() {

    public static String encodeHexString(final byte[] bytes) {

        final char[] out = new char[bytes.length * 2];

        encodeHex(bytes, 0, bytes.length, DIGITS_LOWER, out, 0);
        return new String(out);

    // The following comes from commons-codec

     * Used to build output as hex.

    private static final char[] DIGITS_LOWER = {
            '0', '1', '2', '3', '4', '5', '6', '7',
            '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'

     * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.
     * @param data       a byte[] to convert to hex characters
     * @param dataOffset the position in {@code data} to start encoding from
     * @param dataLen    the number of bytes from {@code dataOffset} to encode
     * @param toDigits   the output alphabet (must contain at least 16 chars)
     * @param out        a char[] which will hold the resultant appropriate characters from the alphabet.
     * @param outOffset  the position within {@code out} at which to start writing the encoded characters.
    private static void encodeHex(final byte[] data, final int dataOffset, final int dataLen, final char[] toDigits,
                                  final char[] out, final int outOffset) {
        // two characters form the hex value.
        for (int i = dataOffset, j = outOffset; i < dataOffset + dataLen; i++) {
            out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
            out[j++] = toDigits[0x0F & data[i]];


       // Can be replaced in Java 17 with the following:

    private static final java.util.HexFormat HEX_FORMAT = HexFormat.of();

    public static String encodeHex(byte[] bytes) {
        return HEX_FORMAT.formatHex(bytes);




Or download all them as a single archive file:

File name:
File size: 625318 bytes
Release date: 2022-11-10


Download and Install HttpComponents Core Binary Package

Download and Install HttpComponents Client Source Package

Download and Review Apache HttpComponents-*.jar

⇑⇑ FAQ for Apache HttpComponents JAR Library

2023-03-26, 15696👍, 1💬