title: Client Error (400) when deploying application to app engine via eclipse
body: <p>I am new to Google App Engine and I am trying to deploy my application via eclipse. The problem I get when I try to deploy my application is that it gives me the following error:</p>
  
  <p>Unable to update app: Error posting to URL: <a href="https://appengine.google.com/api/appversion/getresourcelimits?app_id=Project&amp;version=1&amp;" rel="nofollow">https://appengine.google.com/api/appversion/getresourcelimits?app_id=Project&amp;version=1&amp;</a>
  400 Bad Request
  Client Error (400)
  The request is invalid for an unspecified reason.
  See the deployment console for more details
  Unable to update app: Error posting to </p>
  
  <p>When I look into the link provided by the console I get the following : 
  Unable to update:
  com.google.appengine.tools.admin.HttpIoException: Error posting to URL: <a href="https://appengine.google.com/api/appversion/getresourcelimits?app_id=Project&amp;version=1&amp;" rel="nofollow">https://appengine.google.com/api/appversion/getresourcelimits?app_id=Project&amp;version=1&amp;</a>
  400 Bad Request</p>
  
  <p>Client Error (400)
  The request is invalid for an unspecified reason.</p>
  
  <pre><code>at com.google.appengine.tools.admin.AbstractServerConnection.send1(AbstractServerConnection.java:293)
  at com.google.appengine.tools.admin.AbstractServerConnection.send(AbstractServerConnection.java:253)
  at com.google.appengine.tools.admin.AbstractServerConnection.post(AbstractServerConnection.java:232)
  at com.google.appengine.tools.admin.ResourceLimits.remoteRequest(ResourceLimits.java:171)
  at com.google.appengine.tools.admin.ResourceLimits.request(ResourceLimits.java:138)
  at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:366)
  at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:53)
  at com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:433)
  at com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:148)
  at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
  at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
  </code></pre>
  
  <p>Can anybody please give me some guidance to resolve this problem, so that I can deploy my application? Any feedback will be appreciated, thanks. </p>