public long determineLength(HttpMessage httpMessage) throws HttpException {
Args.notNull(httpMessage, "HTTP message");
Header firstHeader = httpMessage.getFirstHeader(HTTP.TRANSFER_ENCODING);
if (firstHeader != null) {
String value = firstHeader.getValue();
if (HTTP.CHUNK_CODING.equalsIgnoreCase(value)) {
if (!httpMessage.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
return -2;
}
throw new ProtocolException(
"Chunked transfer encoding not allowed for " + httpMessage.getProtocolVersion());
} else if (HTTP.IDENTITY_CODING.equalsIgnoreCase(value)) {
return -1;
} else {
throw new ProtocolException("Unsupported transfer encoding: " + value);
}
}
firstHeader = httpMessage.getFirstHeader(HTTP.CONTENT_LEN);
if (firstHeader == null) {
return (long) this.implicitLen;
}
String value2 = firstHeader.getValue();
try {
long parseLong = Long.parseLong(value2);
if (parseLong >= 0) {
return parseLong;
}
throw new ProtocolException("Negative content length: " + value2);
} catch (NumberFormatException e) {
throw new ProtocolException("Invalid content length: " + value2);
}
}
public static UserAgent fromHttpMessage(HttpMessage httpMessage) {
Header firstHeader = httpMessage.getFirstHeader(NAME);
if (firstHeader == null) {
return null;
}
return new UserAgent(firstHeader.getValue());
}
/*
* Retrieves the full header value by combining multiple headers and
* separating with commas, canonicalizing whitespace along the way.
*
* @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
*/
public static String getCanonicalHeaderValue(HttpMessage r, String name) {
if (isSingleHeader(name)) {
Header h = r.getFirstHeader(name);
return (h != null) ? h.getValue() : null;
}
StringBuilder buf = new StringBuilder();
boolean first = true;
for (Header h : r.getHeaders(name)) {
if (!first) {
buf.append(", ");
}
buf.append(h.getValue().trim());
first = false;
}
return buf.toString();
}