diff --git a/src/main/java/com/github/dockerjava/api/command/BuildImageCmd.java b/src/main/java/com/github/dockerjava/api/command/BuildImageCmd.java
index ac98db2f9..2ab9e841d 100644
--- a/src/main/java/com/github/dockerjava/api/command/BuildImageCmd.java
+++ b/src/main/java/com/github/dockerjava/api/command/BuildImageCmd.java
@@ -3,6 +3,7 @@
 import java.io.File;
 import java.io.InputStream;
 import java.net.URI;
+import java.util.List;
 import java.util.Map;
 
 import javax.annotation.CheckForNull;
@@ -34,10 +35,18 @@ public interface BuildImageCmd extends AsyncDockerCmd<BuildImageCmd, BuildRespon
 
     /**
      * "t" in API
+     * @deprecated use {@link #getTags()}
      */
     @CheckForNull
+    @Deprecated
     String getTag();
 
+    /**
+     * Multple "t" tags.
+     */
+    @CheckForNull
+    List<String> getTags();
+
     /**
      * "remote" in API
      */
@@ -109,8 +118,14 @@ public interface BuildImageCmd extends AsyncDockerCmd<BuildImageCmd, BuildRespon
 
     // setters
 
+    /**
+     * @deprecated use #withTags()
+     */
+    @Deprecated
     BuildImageCmd withTag(String tag);
 
+    BuildImageCmd withTags(List<String> tags);
+
     BuildImageCmd withRemote(URI remote);
 
     BuildImageCmd withBaseDirectory(File baseDirectory);
diff --git a/src/main/java/com/github/dockerjava/core/command/BuildImageCmdImpl.java b/src/main/java/com/github/dockerjava/core/command/BuildImageCmdImpl.java
index c34b05155..6f91a9cd9 100644
--- a/src/main/java/com/github/dockerjava/core/command/BuildImageCmdImpl.java
+++ b/src/main/java/com/github/dockerjava/core/command/BuildImageCmdImpl.java
@@ -7,6 +7,7 @@
 import java.io.InputStream;
 import java.net.URI;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import com.github.dockerjava.api.command.BuildImageCmd;
@@ -15,6 +16,8 @@
 import com.github.dockerjava.core.dockerfile.Dockerfile;
 import com.github.dockerjava.core.util.FilePathUtil;
 
+import javax.annotation.CheckForNull;
+
 /**
  *
  * Build an image from Dockerfile.
@@ -24,8 +27,11 @@ public class BuildImageCmdImpl extends AbstrAsyncDockerCmd<BuildImageCmd, BuildR
 
     private InputStream tarInputStream;
 
+    @Deprecated
     private String tag;
 
+    private List<String> tags;
+
     private Boolean noCache;
 
     private Boolean remove = true;
@@ -82,11 +88,17 @@ public BuildImageCmdImpl(BuildImageCmd.Exec exec, InputStream tarInputStream) {
 
     // getters API
 
+    @Deprecated
     @Override
     public String getTag() {
         return tag;
     }
 
+    @CheckForNull
+    public List<String> getTags() {
+        return tags;
+    }
+
     @Override
     public URI getRemote() {
         return remote;
@@ -178,6 +190,10 @@ public Long getShmsize() {
 
     // setters
 
+    /**
+     * @deprecated use #withTags()
+     */
+    @Deprecated
     @Override
     public BuildImageCmdImpl withTag(String tag) {
         checkNotNull(tag, "Tag is null");
@@ -185,6 +201,12 @@ public BuildImageCmdImpl withTag(String tag) {
         return this;
     }
 
+    @Override
+    public BuildImageCmdImpl withTags(List<String> tags) {
+        this.tags = tags;
+        return this;
+    }
+
     @Override
     public BuildImageCmd withRemote(URI remote) {
         this.remote = remote;
diff --git a/src/main/java/com/github/dockerjava/netty/WebTarget.java b/src/main/java/com/github/dockerjava/netty/WebTarget.java
index ef1510f5c..883f00601 100644
--- a/src/main/java/com/github/dockerjava/netty/WebTarget.java
+++ b/src/main/java/com/github/dockerjava/netty/WebTarget.java
@@ -1,41 +1,56 @@
 package com.github.dockerjava.netty;
 
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.nio.charset.Charset;
+import java.nio.charset.UnsupportedCharsetException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.netty.handler.codec.http.HttpConstants;
 import org.apache.commons.lang.StringUtils;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 
 /**
- * This class is basically a replacement of javax.ws.rs.client.WebTarget to allow simpler migration of JAX-RS code to a netty based
+ * This class is basically a replacement of {@link javax.ws.rs.client.WebTarget} to allow simpler migration of JAX-RS code to a netty based
  * implementation.
  *
  * @author Marcus Linke
  */
 public class WebTarget {
+    private static final ObjectMapper MAPPER = new ObjectMapper();
 
     private final ChannelProvider channelProvider;
 
     private final ImmutableList<String> path;
 
     private final ImmutableMap<String, String> queryParams;
+    /**
+     * Multiple values for the same name param.
+     */
+    private final ImmutableMap<String, List<String>> queryParamsList;
 
     private static final String PATH_SEPARATOR = "/";
 
     public WebTarget(ChannelProvider channelProvider) {
-        this(channelProvider, ImmutableList.<String>of(), ImmutableMap.<String, String>of());
+        this(channelProvider, ImmutableList.<String>of(), ImmutableMap.<String, String>of(),
+                ImmutableMap.<String, List<String>>of());
     }
 
     private WebTarget(ChannelProvider channelProvider,
                       ImmutableList<String> path,
-                      ImmutableMap<String, String> queryParams) {
+                      ImmutableMap<String, String> queryParams,
+                      ImmutableMap<String, List<String>> queryParamsList) {
         this.channelProvider = channelProvider;
         this.path = path;
         this.queryParams = queryParams;
+        this.queryParamsList = queryParamsList;
     }
 
     public WebTarget path(String... components) {
@@ -45,7 +60,7 @@ public WebTarget path(String... components) {
             newPath.addAll(Arrays.asList(StringUtils.split(component, PATH_SEPARATOR)));
         }
 
-        return new WebTarget(channelProvider, newPath.build(), queryParams);
+        return new WebTarget(channelProvider, newPath.build(), queryParams, queryParamsList);
     }
 
     public InvocationBuilder request() {
@@ -53,7 +68,13 @@ public InvocationBuilder request() {
 
         List<String> params = new ArrayList<>();
         for (Map.Entry<String, String> entry : queryParams.entrySet()) {
-            params.add(entry.getKey() + "=" + entry.getValue());
+            params.add(entry.getKey() + "=" + encodeComponent(entry.getValue(), HttpConstants.DEFAULT_CHARSET));
+        }
+
+        for (Map.Entry<String, List<String>> entry : queryParamsList.entrySet()) {
+            for (String entryValueValue : entry.getValue()) {
+                params.add(entry.getKey() + "=" + encodeComponent(entryValueValue, HttpConstants.DEFAULT_CHARSET));
+            }
         }
 
         if (!params.isEmpty()) {
@@ -63,13 +84,25 @@ public InvocationBuilder request() {
         return new InvocationBuilder(channelProvider, resource);
     }
 
+    /**
+     * @see io.netty.handler.codec.http.QueryStringEncoder
+     */
+    private static String encodeComponent(String s, Charset charset) {
+        // TODO: Optimize me.
+        try {
+            return URLEncoder.encode(s, charset.name()).replace("+", "%20");
+        } catch (UnsupportedEncodingException ignored) {
+            throw new UnsupportedCharsetException(charset.name());
+        }
+    }
+
     public WebTarget resolveTemplate(String name, Object value) {
         ImmutableList.Builder<String> newPath = ImmutableList.builder();
         for (String component : path) {
             component = component.replaceAll("\\{" + name + "\\}", value.toString());
             newPath.add(component);
         }
-        return new WebTarget(channelProvider, newPath.build(), queryParams);
+        return new WebTarget(channelProvider, newPath.build(), queryParams, queryParamsList);
     }
 
     public WebTarget queryParam(String name, Object value) {
@@ -77,7 +110,32 @@ public WebTarget queryParam(String name, Object value) {
         if (value != null) {
             builder.put(name, value.toString());
         }
-        return new WebTarget(channelProvider, path, builder.build());
+        return new WebTarget(channelProvider, path, builder.build(), queryParamsList);
+    }
+
+    public WebTarget queryParamsList(String name, List<?> values) {
+        ImmutableMap.Builder<String, List<String>> builder = ImmutableMap.<String, List<String>>builder().putAll(queryParamsList);
+        if (values != null) {
+            ImmutableList.Builder<String> valueBuilder = ImmutableList.builder();
+            for (Object value : values) {
+                valueBuilder.add(value.toString());
+            }
+            builder.put(name, valueBuilder.build());
+        }
+        return new WebTarget(channelProvider, path, queryParams, builder.build());
+    }
+
+    public WebTarget queryParamsJsonMap(String name, Map<String, String> values) {
+        if (values != null && !values.isEmpty()) {
+            try {
+                // when param value is JSON string
+                return queryParam(name, MAPPER.writeValueAsString(values));
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        } else {
+            return this;
+        }
     }
 
     @Override
@@ -97,7 +155,14 @@ public boolean equals(Object o) {
         if (path != null ? !path.equals(webTarget.path) : webTarget.path != null) {
             return false;
         }
-        return queryParams != null ? queryParams.equals(webTarget.queryParams) : webTarget.queryParams == null;
+        if (queryParams != null ? !queryParams.equals(webTarget.queryParams) : webTarget.queryParams != null) {
+            return false;
+        }
+        if (queryParamsList != null ? !queryParamsList.equals(webTarget.queryParamsList) : webTarget.queryParamsList != null) {
+            return false;
+        }
+
+        return true;
     }
 
     @Override
@@ -105,6 +170,7 @@ public int hashCode() {
         int result = channelProvider != null ? channelProvider.hashCode() : 0;
         result = 31 * result + (path != null ? path.hashCode() : 0);
         result = 31 * result + (queryParams != null ? queryParams.hashCode() : 0);
+        result = 31 * result + (queryParamsList != null ? queryParamsList.hashCode() : 0);
         return result;
     }
 }
diff --git a/src/main/java/com/github/dockerjava/netty/exec/BuildImageCmdExec.java b/src/main/java/com/github/dockerjava/netty/exec/BuildImageCmdExec.java
index 43152570e..6e2cfde6b 100644
--- a/src/main/java/com/github/dockerjava/netty/exec/BuildImageCmdExec.java
+++ b/src/main/java/com/github/dockerjava/netty/exec/BuildImageCmdExec.java
@@ -21,8 +21,6 @@ public class BuildImageCmdExec extends AbstrAsyncDockerCmdExec<BuildImageCmd, Bu
         BuildImageCmd.Exec {
     private static final Logger LOGGER = LoggerFactory.getLogger(BuildImageCmdExec.class);
 
-    private static final ObjectMapper MAPPER = new ObjectMapper();
-
     public BuildImageCmdExec(WebTarget baseResource, DockerClientConfig dockerClientConfig) {
         super(baseResource, dockerClientConfig);
     }
@@ -58,6 +56,9 @@ protected Void execute0(BuildImageCmd command, ResultCallback<BuildResponseItem>
         if (command.getTag() != null) {
             webTarget = webTarget.queryParam("t", command.getTag());
         }
+        if (command.getTags() != null) {
+            webTarget = webTarget.queryParamsList("t", command.getTags());
+        }
         if (command.getRemote() != null) {
             webTarget = webTarget.queryParam("remote", command.getRemote().toString());
         }
@@ -86,13 +87,17 @@ protected Void execute0(BuildImageCmd command, ResultCallback<BuildResponseItem>
             webTarget = webTarget.queryParam("cpusetcpus", command.getCpusetcpus());
         }
 
-        webTarget = writeMap(webTarget, "buildargs", command.getBuildArgs());
+        if (command.getBuildArgs() != null) {
+            webTarget = webTarget.queryParamsJsonMap("buildargs", command.getBuildArgs());
+        }
 
         if (command.getShmsize() != null) {
             webTarget = webTarget.queryParam("shmsize", command.getShmsize());
         }
 
-        webTarget = writeMap(webTarget, "labels", command.getLabels());
+        if (command.getLabels() != null) {
+            webTarget = webTarget.queryParamsJsonMap("labels", command.getLabels());
+        }
 
         LOGGER.trace("POST: {}", webTarget);
 
@@ -106,16 +111,4 @@ protected Void execute0(BuildImageCmd command, ResultCallback<BuildResponseItem>
 
         return null;
     }
-
-    private WebTarget writeMap(WebTarget webTarget, String name, Map<String, String> value) {
-        if (value != null && !value.isEmpty()) {
-            try {
-                return webTarget.queryParam(name, MAPPER.writeValueAsString(value));
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        } else {
-            return webTarget;
-        }
-    }
 }