splitHeader() — netty Function Reference

Source Code

codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java lines 1028–1075

    private void splitHeader(byte[] line, int start, int length) {
        final int end = start + length;
        int nameEnd;
        final int nameStart = start;
        // hoist this load out of the loop, because it won't change!
        final boolean isDecodingRequest = isDecodingRequest();
        for (nameEnd = nameStart; nameEnd < end; nameEnd ++) {
            byte ch = line[nameEnd];
            // https://tools.ietf.org/html/rfc7230#section-3.2.4
            //
            // No whitespace is allowed between the header field-name and colon. In
            // the past, differences in the handling of such whitespace have led to
            // security vulnerabilities in request routing and response handling. A
            // server MUST reject any received request message that contains
            // whitespace between a header field-name and colon with a response code
            // of 400 (Bad Request). A proxy MUST remove any such whitespace from a
            // response message before forwarding the message downstream.
            if (ch == ':' ||
                    // In case of decoding a request we will just continue processing and header validation
                    // is done in the DefaultHttpHeaders implementation.
                    //
                    // In the case of decoding a response we will "skip" the whitespace.
                    (!isDecodingRequest && isOWS(ch))) {
                break;
            }
        }

        if (nameEnd == end) {
            // There was no colon present at all.
            throw new IllegalArgumentException("No colon found");
        }
        int colonEnd;
        for (colonEnd = nameEnd; colonEnd < end; colonEnd ++) {
            if (line[colonEnd] == ':') {
                colonEnd ++;
                break;
            }
        }
        name = splitHeaderName(line, nameStart, nameEnd - nameStart);
        final int valueStart = findNonWhitespace(line, colonEnd, end);
        if (valueStart == end) {
            value = StringUtil.EMPTY_STRING;
        } else {
            final int valueEnd = findEndOfString(line, start, end);
            // no need to make uses of the ByteBuf's toString ASCII method here, and risk to get JIT confused
            value = langAsciiString(line, valueStart, valueEnd - valueStart);
        }
    }