diff --git a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgConfig.java b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgConfig.java
index ed336ff203..2eb060cb66 100644
--- a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgConfig.java
+++ b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/repository/HgConfig.java
@@ -127,6 +127,10 @@ public class HgConfig extends SimpleRepositoryConfig
     return disableHookSSLValidation;
   }
 
+  public boolean isEnableHttpPostArgs() {
+    return enableHttpPostArgs;
+  }
+
   /**
    * Method description
    *
@@ -197,6 +201,10 @@ public class HgConfig extends SimpleRepositoryConfig
     this.showRevisionInId = showRevisionInId;
   }
 
+  public void setEnableHttpPostArgs(boolean enableHttpPostArgs) {
+    this.enableHttpPostArgs = enableHttpPostArgs;
+  }
+
   /**
    * Method description
    *
@@ -232,6 +240,8 @@ public class HgConfig extends SimpleRepositoryConfig
   /** Field description */
   private boolean showRevisionInId = false;
 
+  private boolean enableHttpPostArgs = false;
+
   /**
    * disable validation of ssl certificates for mercurial hook
    * @see <a href="https://goo.gl/zH5eY8">Issue 959</a>
diff --git a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgCGIServlet.java b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgCGIServlet.java
index f6023dd0ae..1fb78161e0 100644
--- a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgCGIServlet.java
+++ b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgCGIServlet.java
@@ -87,6 +87,8 @@ public class HgCGIServlet extends HttpServlet
   /** Field description */
   public static final String ENV_REPOSITORY_PATH = "SCM_REPOSITORY_PATH";
 
+  private static final String ENV_HTTP_POST_ARGS = "SCM_HTTP_POST_ARGS";
+
   /** Field description */
   public static final String ENV_SESSION_PREFIX = "SCM_";
 
@@ -278,11 +280,15 @@ public class HgCGIServlet extends HttpServlet
       environment.put(ENV_PYTHON_HTTPS_VERIFY, "0");
     }
 
+    // enable experimental httppostargs protocol of mercurial
+    // Issue 970: https://goo.gl/poascp
+    environment.put(ENV_HTTP_POST_ARGS, String.valueOf(handler.getConfig().isEnableHttpPostArgs()));
+
     //J-
     HgEnvironment.prepareEnvironment(
       environment,
       handler,
-      hookManager, 
+      hookManager,
       request
     );
     //J+
diff --git a/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/hg.config.js b/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/hg.config.js
index 58a73ea8e9..f7b4f33240 100644
--- a/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/hg.config.js
+++ b/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/hg.config.js
@@ -48,6 +48,7 @@ Sonia.hg.ConfigPanel = Ext.extend(Sonia.config.ConfigForm, {
   showRevisionInIdText: 'Show Revision',
   // TODO: i18n
   disableHookSSLValidationText: 'Disable SSL Validation on Hooks',
+  enableHttpPostArgsText: 'Enable HttpPostArgs Protocol',
 
   // helpText
   hgBinaryHelpText: 'Location of Mercurial binary.',
@@ -63,6 +64,8 @@ Sonia.hg.ConfigPanel = Ext.extend(Sonia.config.ConfigForm, {
   // TODO: i18n
   disableHookSSLValidationHelpText: 'Disables the validation of ssl certificates for the mercurial hook, which forwards the repository changes back to scm-manager. \n\
                                      This option should only be used, if SCM-Manager uses a self signed certificate.',
+  // TODO explain it
+  enableHttpPostArgsHelpText: 'Enables the experimental HttpPostArgs Protocol.',
 
   initComponent: function(){
 
@@ -115,12 +118,18 @@ Sonia.hg.ConfigPanel = Ext.extend(Sonia.config.ConfigForm, {
         fieldLabel: this.disableHookSSLValidationText,
         inputValue: 'true',
         helpText: this.disableHookSSLValidationHelpText
+      },{
+        xtype: 'checkbox',
+        name: 'enableHttpPostArgs',
+        fieldLabel: this.enableHttpPostArgsText,
+        inputValue: 'true',
+        helpText: this.enableHttpPostArgsHelpText
       },{
         xtype: 'checkbox',
         name: 'disabled',
         fieldLabel: this.disabledText,
         inputValue: 'true',
-        helpText: this.disabledHelpText        
+        helpText: this.disabledHelpText
       },{
         xtype: 'button',
         text: this.configWizardText,
@@ -260,11 +269,11 @@ Sonia.repository.typeIcons['hg'] = 'resources/images/icons/16x16/mercurial.png';
 // override ChangesetViewerGrid to render changeset id's with revisions
 
 Ext.override(Sonia.repository.ChangesetViewerGrid, {
-  
+
   isMercurialRepository: function(){
     return this.repository.type === 'hg';
   },
-  
+
   getChangesetId: function(id, record){
     if ( this.isMercurialRepository() ){
       var rev = Sonia.util.getProperty(record.get('properties'), 'hg.rev');
@@ -274,7 +283,7 @@ Ext.override(Sonia.repository.ChangesetViewerGrid, {
     }
     return id;
   },
-  
+
   getParentIds: function(id, record){
     var parents = record.get('parents');
     if ( this.isMercurialRepository() ){
@@ -285,7 +294,7 @@ Ext.override(Sonia.repository.ChangesetViewerGrid, {
           parents[0] = rev + ':' + parents[0];
         }
         if ( parents.length > 1 ){
-          rev = Sonia.util.getProperty(properties, 'hg.p2.rev');          
+          rev = Sonia.util.getProperty(properties, 'hg.p2.rev');
           if (rev){
             parents[1] = rev + ':' + parents[1];
           }
@@ -294,5 +303,5 @@ Ext.override(Sonia.repository.ChangesetViewerGrid, {
     }
     return parents;
   }
-  
+
 });
diff --git a/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/python/hgweb.py b/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/python/hgweb.py
index 66d5fadc3c..ff2869044d 100644
--- a/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/python/hgweb.py
+++ b/scm-plugins/scm-hg-plugin/src/main/resources/sonia/scm/python/hgweb.py
@@ -31,12 +31,21 @@
 
 
 import os
-from mercurial import demandimport
+from mercurial import demandimport, ui as uimod, hg
 from mercurial.hgweb import hgweb, wsgicgi
 
-repositoryPath = os.environ['SCM_REPOSITORY_PATH']
-
 demandimport.enable()
 
-application = hgweb(repositoryPath)
+u = uimod.ui.load()
+
+# pass SCM_HTTP_POST_ARGS to enable experimental httppostargs protocol of mercurial
+# SCM_HTTP_POST_ARGS is set by HgCGIServlet
+# Issue 970: https://goo.gl/poascp
+u.setconfig('experimental', 'httppostargs', os.environ['SCM_HTTP_POST_ARGS'])
+
+# open repository
+# SCM_REPOSITORY_PATH contains the repository path and is set by HgCGIServlet
+r = hg.repository(u, os.environ['SCM_REPOSITORY_PATH'])
+
+application = hgweb(r)
 wsgicgi.launch(application)