pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/thirdparty/ch/boye/httpclientandroidlib/client/protocol/RequestExpectContinue.java

@@ -0,0 +1,82 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package ch.boye.httpclientandroidlib.client.protocol;
+
+import java.io.IOException;
+
+import ch.boye.httpclientandroidlib.HttpEntity;
+import ch.boye.httpclientandroidlib.HttpEntityEnclosingRequest;
+import ch.boye.httpclientandroidlib.HttpException;
+import ch.boye.httpclientandroidlib.HttpRequest;
+import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
+import ch.boye.httpclientandroidlib.HttpVersion;
+import ch.boye.httpclientandroidlib.ProtocolVersion;
+import ch.boye.httpclientandroidlib.annotation.Immutable;
+import ch.boye.httpclientandroidlib.client.config.RequestConfig;
+import ch.boye.httpclientandroidlib.protocol.HTTP;
+import ch.boye.httpclientandroidlib.protocol.HttpContext;
+import ch.boye.httpclientandroidlib.util.Args;
+
+/**
+ * RequestExpectContinue is responsible for enabling the 'expect-continue'
+ * handshake by adding <code>Expect</code> header.
+ * <p/>
+ * This interceptor takes into account {@link RequestConfig#isExpectContinueEnabled()}
+ * setting.
+ *
+ * @since 4.3
+ */
+@Immutable
+public class RequestExpectContinue implements HttpRequestInterceptor {
+
+    public RequestExpectContinue() {
+        super();
+    }
+
+    public void process(final HttpRequest request, final HttpContext context)
+            throws HttpException, IOException {
+        Args.notNull(request, "HTTP request");
+
+        if (!request.containsHeader(HTTP.EXPECT_DIRECTIVE)) {
+            if (request instanceof HttpEntityEnclosingRequest) {
+                final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
+                final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
+                // Do not send the expect header if request body is known to be empty
+                if (entity != null
+                        && entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
+                    final HttpClientContext clientContext = HttpClientContext.adapt(context);
+                    final RequestConfig config = clientContext.getRequestConfig();
+                    if (config.isExpectContinueEnabled()) {
+                        request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE);
+                    }
+                }
+            }
+        }
+    }
+
+}