Method emitHeader

java/org/apache/coyote/http2/Stream.java:322–514

(String name, String value)

    @Override
    public final void emitHeader(String name, String value) throws HpackException {
        if (log.isTraceEnabled()) {
            log.trace(sm.getString("stream.header.debug", getConnectionId(), getIdAsString(), name, value));
        }

        // Field header names being all lower case is enforced in HpackDecoder.

        if (HTTP_CONNECTION_SPECIFIC_HEADERS.contains(name)) {
            headerException = new StreamException(
                    sm.getString("stream.header.connection", getConnectionId(), getIdAsString(), name),
                    Http2Error.PROTOCOL_ERROR, getIdAsInt());
            // No need for further processing. The stream will be reset.
            return;
        }

        if ("te".equals(name)) {
            if (!"trailers".equals(value)) {
                headerException =
                        new StreamException(sm.getString("stream.header.te", getConnectionId(), getIdAsString(), value),
                                Http2Error.PROTOCOL_ERROR, getIdAsInt());
                // No need for further processing. The stream will be reset.
                return;
            }
        }

        if (headerException != null) {
            // Don't bother processing the header since the stream is going to
            // be reset anyway
            return;
        }

        if (name.isEmpty()) {
            headerException =
                    new StreamException(sm.getString("stream.header.empty", getConnectionId(), getIdAsString()),
                            Http2Error.PROTOCOL_ERROR, getIdAsInt());
            // No need for further processing. The stream will be reset.
            return;
        }

        boolean pseudoHeader = name.charAt(0) == ':';

        if (pseudoHeader && headerState != HEADER_STATE_PSEUDO) {
            headerException = new StreamException(
                    sm.getString("stream.header.unexpectedPseudoHeader", getConnectionId(), getIdAsString(), name),
                    Http2Error.PROTOCOL_ERROR, getIdAsInt());
            // No need for further processing. The stream will be reset.
            return;
        }

        if (headerState == HEADER_STATE_PSEUDO && !pseudoHeader) {
            headerState = HEADER_STATE_REGULAR;
        }

        if (headerState == HEADER_STATE_TRAILER && !handler.getProtocol().isTrailerHeaderAllowed(name)) {
            // Processing trailers and the header is not in the allowed list
            return;
        }