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* This class recognizes "chunked" transfer-coding only. * * @since 5.0 */ @Contract(threading = ThreadingBehavior.IMMUTABLE) public class DefaultContentLengthStrategy implements ContentLengthStrategy { public static final DefaultContentLengthStrategy INSTANCE = new DefaultContentLengthStrategy(); /** * Creates {@code DefaultContentLengthStrategy} instance. {@link ContentLengthStrategy#UNDEFINED} * is used per default when content length is not explicitly specified in the message. */ public DefaultContentLengthStrategy() { } @Override public long determineLength(final HttpMessage message) throws HttpException { Args.notNull(message, "HTTP message"); // Although Transfer-Encoding is specified as a list, in practice // it is either missing or has the single value "chunked". So we // treat it as a single-valued header here. final Header transferEncodingHeader = message.getFirstHeader(HttpHeaders.TRANSFER_ENCODING); if (transferEncodingHeader != null) { final String s = transferEncodingHeader.getValue(); if (HeaderElements.CHUNKED_ENCODING.equalsIgnoreCase(s)) { return CHUNKED; } throw new NotImplementedException("Unsupported transfer encoding: " + s); } if (message.containsHeaders(HttpHeaders.CONTENT_LENGTH) > 1) { throw new ProtocolException("Multiple Content-Length headers"); } final Header contentLengthHeader = message.getFirstHeader(HttpHeaders.CONTENT_LENGTH); if (contentLengthHeader != null) { final String s = contentLengthHeader.getValue(); try { final long len = Long.parseLong(s); if (len < 0) { throw new ProtocolException("Negative content length: " + s); } return len; } catch (final NumberFormatException e) { throw new ProtocolException("Invalid content length: " + s); } } return UNDEFINED; } }