#27 customize http header for downloader

webmagic-core/src/main/java/us/codecraft/webmagic/Site.java

@@ -8,8 +8,8 @@ import java.util.*;
  * Object contains setting for crawler.<br>
  *
  * @author code4crafter@gmail.com <br>
- * @since 0.1.0
  * @see us.codecraft.webmagic.processor.PageProcessor
+ * @since 0.1.0
  */
 public class Site {
 
@@ -38,6 +38,14 @@ public class Site {
 
     private Set<Integer> acceptStatCode = DEFAULT_STATUS_CODE_SET;
 
+    private Map<String,String> headers = new HashMap<String, String>();
+
+    public static interface HeaderConst {
+
+        public static final String REFERER = "Referer";
+    }
+
+
     static {
         DEFAULT_STATUS_CODE_SET.add(200);
     }
@@ -139,10 +147,12 @@ public class Site {
 
     /**
      * set timeout for downloader in ms
+     *
      * @param timeOut
      */
-    public void setTimeOut(int timeOut) {
+    public Site setTimeOut(int timeOut) {
         this.timeOut = timeOut;
+        return this;
     }
 
     /**
@@ -216,7 +226,7 @@ public class Site {
     }
 
     /**
-     * Get retry times when download fail immediately, 0 by default.<br>
+     * Get retry times immediately when download fail, 0 by default.<br>
      *
      * @return retry times when download fail
      */
@@ -224,6 +234,22 @@ public class Site {
         return retryTimes;
     }
 
+    public Map<String, String> getHeaders() {
+        return headers;
+    }
+
+    /**
+     * Put an Http header for downloader. <br/>
+     * Use {@link #addCookie(String, String)} for cookie and {@link #setUserAgent(String)} for user-agent. <br/>
+     * @param key key of http header, there are some keys constant in {@link HeaderConst}
+     * @param value value of header
+     * @return
+     */
+    public Site addHeader(String key, String value){
+        headers.put(key,value);
+        return this;
+    }
+
     /**
      * Set retry times when download fail, 0 by default.<br>
      *

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/HttpClientDownloader.java

@@ -19,6 +19,7 @@ import us.codecraft.webmagic.utils.UrlUtils;
 
 import java.io.IOException;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Set;
 
 
@@ -66,10 +67,12 @@ public class HttpClientDownloader implements Downloader {
         int retryTimes = 0;
         Set<Integer> acceptStatCode;
         String charset = null;
+        Map<String,String> headers = null;
         if (site != null) {
             retryTimes = site.getRetryTimes();
             acceptStatCode = site.getAcceptStatCode();
             charset = site.getCharset();
+            headers = site.getHeaders();
         } else {
             acceptStatCode = new HashSet<Integer>();
             acceptStatCode.add(200);
@@ -78,6 +81,11 @@ public class HttpClientDownloader implements Downloader {
         HttpClient httpClient = HttpClientPool.getInstance(poolSize).getClient(site);
         try {
             HttpGet httpGet = new HttpGet(request.getUrl());
+            if (headers!=null){
+                for (Map.Entry<String, String> headerEntry : headers.entrySet()) {
+                    httpGet.addHeader(headerEntry.getKey(),headerEntry.getValue());
+                }
+            }
             HttpResponse httpResponse = null;
             int tried = 0;
             boolean retry;

webmagic-core/src/main/java/us/codecraft/webmagic/downloader/HttpClientPool.java

@@ -54,7 +54,7 @@ public class HttpClientPool {
         }
         params.setIntParameter(CoreConnectionPNames.SO_TIMEOUT, site.getTimeOut());
         params.setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, site.getTimeOut());
-
+        params.setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.BEST_MATCH);
         HttpProtocolParamBean paramsBean = new HttpProtocolParamBean(params);
         paramsBean.setVersion(HttpVersion.HTTP_1_1);
         if (site != null && site.getCharset() != null) {
@@ -73,8 +73,7 @@ public class HttpClientPool {
         if (site != null) {
             generateCookie(httpClient, site);
         }
-        httpClient.getParams().setIntParameter("http.socket.timeout", 60000);
-        httpClient.getParams().setParameter(ClientPNames.COOKIE_POLICY, CookiePolicy.BEST_MATCH);
+
         return httpClient;
     }