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A zero dependency implements of the JDK httpserver designed for Virtual Threads. Includes websocket support.
There is a newer version: 1.0.11
/*
 * Copyright (c) 2005, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package robaho.net.httpserver;

import java.io.*;
import java.util.Objects;

/**
 * a class which allows the caller to write up to a defined
 * number of bytes to an underlying stream. The caller *must*
 * write the pre-defined number or else an exception will be thrown
 * and the whole request aborted.
 * normal close() does not close the underlying stream
 */

class FixedLengthOutputStream extends FilterOutputStream {
    private long remaining;
    private boolean closed = false;
    ExchangeImpl t;

    FixedLengthOutputStream(ExchangeImpl t, OutputStream src, long len) {
        super(src);
        if (len < 0) {
            throw new IllegalArgumentException("Content-length: " + len);
        }
        this.t = t;
        this.remaining = len;
    }

    public void write(int b) throws IOException {
        if (closed) {
            throw new IOException("stream closed");
        }
        if (remaining == 0) {
            throw new StreamClosedException();
        }
        out.write(b);
        remaining--;
    }

    public void write(byte[] b, int off, int len) throws IOException {
        Objects.checkFromIndexSize(off, len, b.length);
        if (len == 0) {
            return;
        }
        if (closed) {
            throw new IOException("stream closed");
        }
        if (len > remaining) {
            // stream is still open, caller can retry
            throw new IOException("too many bytes to write to stream");
        }
        out.write(b, off, len);
        remaining -= len;
    }

    public void close() throws IOException {
        if (closed) {
            return;
        }
        closed = true;
        if (remaining > 0) {
            t.close();
            throw new IOException("insufficient bytes written to stream");
        }
        LeftOverInputStream is = t.getOriginalInputStream();
        // if after reading the rest of the known input for this request, there is
        // more input available, http pipelining is in effect, so avoid flush, since
        // it will be flushed after processing the next request
        if(is.getRawInputStream().available()==0) {
            flush();
        }

        if (!is.isClosed()) {
            try {
                is.close();
            } catch (IOException e) {
            }
        }
    }
}