/**
* Implements a patch out in 4.1.x and 4.2 that isn't available in 4.0.x which fixes a bug where
* connections aren't reused when the response is gzipped. See
* https://issues.apache.org/jira/browse/HTTPCORE-257 for info about the issue, and
* http://svn.apache.org/viewvc?view=revision&revision=1124215 for the patch which is copied
* here.
*/
@Override
public boolean keepAlive(final HttpResponse response, final HttpContext context) {
if (response == null) {
throw new IllegalArgumentException("HTTP response may not be null.");
}
if (context == null) {
throw new IllegalArgumentException("HTTP context may not be null.");
}
// Check for a self-terminating entity. If the end of the entity
// will
// be indicated by closing the connection, there is no keep-alive.
ProtocolVersion ver = response.getStatusLine().getProtocolVersion();
Header teh = response.getFirstHeader(HTTP.TRANSFER_ENCODING);
if (teh != null) {
if (!HTTP.CHUNK_CODING.equalsIgnoreCase(teh.getValue())) {
return false;
}
} else {
Header[] clhs = response.getHeaders(HTTP.CONTENT_LEN);
// Do not reuse if not properly content-length delimited
if (clhs == null || clhs.length != 1) {
return false;
}
Header clh = clhs[0];
try {
int contentLen = Integer.parseInt(clh.getValue());
if (contentLen < 0) {
return false;
}
} catch (NumberFormatException ex) {
return false;
}
}
// Check for the "Connection" header. If that is absent, check for
// the "Proxy-Connection" header. The latter is an unspecified and
// broken but unfortunately common extension of HTTP.
HeaderIterator hit = response.headerIterator(HTTP.CONN_DIRECTIVE);
if (!hit.hasNext()) hit = response.headerIterator("Proxy-Connection");
// Experimental usage of the "Connection" header in HTTP/1.0 is
// documented in RFC 2068, section 19.7.1. A token "keep-alive" is
// used to indicate that the connection should be persistent.
// Note that the final specification of HTTP/1.1 in RFC 2616 does
// not
// include this information. Neither is the "Connection" header
// mentioned in RFC 1945, which informally describes HTTP/1.0.
//
// RFC 2616 specifies "close" as the only connection token with a
// specific meaning: it disables persistent connections.
//
// The "Proxy-Connection" header is not formally specified anywhere,
// but is commonly used to carry one token, "close" or "keep-alive".
// The "Connection" header, on the other hand, is defined as a
// sequence of tokens, where each token is a header name, and the
// token "close" has the above-mentioned additional meaning.
//
// To get through this mess, we treat the "Proxy-Connection" header
// in exactly the same way as the "Connection" header, but only if
// the latter is missing. We scan the sequence of tokens for both
// "close" and "keep-alive". As "close" is specified by RFC 2068,
// it takes precedence and indicates a non-persistent connection.
// If there is no "close" but a "keep-alive", we take the hint.
if (hit.hasNext()) {
try {
TokenIterator ti = createTokenIterator(hit);
boolean keepalive = false;
while (ti.hasNext()) {
final String token = ti.nextToken();
if (HTTP.CONN_CLOSE.equalsIgnoreCase(token)) {
return false;
} else if (HTTP.CONN_KEEP_ALIVE.equalsIgnoreCase(token)) {
// continue the loop, there may be a "close"
// afterwards
keepalive = true;
}
}
if (keepalive) return true;
// neither "close" nor "keep-alive", use default policy
} catch (ParseException px) {
// invalid connection header means no persistent connection
// we don't have logging in HttpCore, so the exception is
// lost
return false;
}
}
// default since HTTP/1.1 is persistent, before it was
// non-persistent
return !ver.lessEquals(HttpVersion.HTTP_1_0);
}
/**
* Handles receives one HTTP request over the given connection within the given execution context
* and sends a response back to the client.
*
* @param conn the active connection to the client
* @param context the actual execution context.
* @throws IOException in case of an I/O error.
* @throws HttpException in case of HTTP protocol violation or a processing problem.
*/
public void handleRequest(final HttpServerConnection conn, final HttpContext context)
throws IOException, HttpException {
context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
HttpResponse response = null;
try {
HttpRequest request = conn.receiveRequestHeader();
request.setParams(new DefaultedHttpParams(request.getParams(), this.params));
ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
if (!ver.lessEquals(HttpVersion.HTTP_1_1)) {
// Downgrade protocol version if greater than HTTP/1.1
ver = HttpVersion.HTTP_1_1;
}
if (request instanceof HttpEntityEnclosingRequest) {
if (((HttpEntityEnclosingRequest) request).expectContinue()) {
response = this.responseFactory.newHttpResponse(ver, HttpStatus.SC_CONTINUE, context);
response.setParams(new DefaultedHttpParams(response.getParams(), this.params));
if (this.expectationVerifier != null) {
try {
this.expectationVerifier.verify(request, response, context);
} catch (HttpException ex) {
response =
this.responseFactory.newHttpResponse(
HttpVersion.HTTP_1_0, HttpStatus.SC_INTERNAL_SERVER_ERROR, context);
response.setParams(new DefaultedHttpParams(response.getParams(), this.params));
handleException(ex, response);
}
}
if (response.getStatusLine().getStatusCode() < 200) {
// Send 1xx response indicating the server expections
// have been met
conn.sendResponseHeader(response);
conn.flush();
response = null;
conn.receiveRequestEntity((HttpEntityEnclosingRequest) request);
}
} else {
conn.receiveRequestEntity((HttpEntityEnclosingRequest) request);
}
}
if (response == null) {
response = this.responseFactory.newHttpResponse(ver, HttpStatus.SC_OK, context);
response.setParams(new DefaultedHttpParams(response.getParams(), this.params));
context.setAttribute(ExecutionContext.HTTP_REQUEST, request);
context.setAttribute(ExecutionContext.HTTP_RESPONSE, response);
this.processor.process(request, context);
doService(request, response, context);
}
// Make sure the request content is fully consumed
if (request instanceof HttpEntityEnclosingRequest) {
HttpEntity entity = ((HttpEntityEnclosingRequest) request).getEntity();
if (entity != null) {
entity.consumeContent();
}
}
} catch (HttpException ex) {
response =
this.responseFactory.newHttpResponse(
HttpVersion.HTTP_1_0, HttpStatus.SC_INTERNAL_SERVER_ERROR, context);
response.setParams(new DefaultedHttpParams(response.getParams(), this.params));
handleException(ex, response);
}
this.processor.process(response, context);
conn.sendResponseHeader(response);
conn.sendResponseEntity(response);
conn.flush();
if (!this.connStrategy.keepAlive(response, context)) {
conn.close();
}
}