Below is the response which i'm getting when i hit the above url using CURL
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\395152>curl -u admin:admin http://localhost:4502/crx/packmgr/service.jsp
<crx version="2.4.30" user="admin" workspace="crx.default">
<request>
</request>
<response>
<data>
+------------+-----------------------------------------+
| Arguments | Comment |
+------------+-----------------------------------------+
| cmd=help | print this help |
+------------+-----------------------------------------+
| cmd=ls | print a list of all packages |
+------------+-----------------------------------------+
| cmd=rm | remove a package |
| name | package name |
| [group] | group name (optional) |
+------------+-----------------------------------------+
| cmd=build | build a package |
| name | package name |
| [group] | group name (optional) |
+------------+-----------------------------------------+
| cmd=inst | install a package |
| name | package name |
| [group] | group name (optional) |
+------------+-----------------------------------------+
| cmd=uninst| uninstall a package |
| name | package name |
| [group] | group name (optional) |
+------------+-----------------------------------------+
| GET | download a package |
| | (content-disposition header contains |
| | the correct filename) |
| [cmd=get] | optional |
| name | package name |
| [group] | group name (optional) |
+------------+-----------------------------------------+
| POST | upload a new package |
| file | package to upload |
| [name] | optional name |
| [install] | automatically install package if 'true' |
+------------+-----------------------------------------+
</data>
<status code="200">ok</status>
</response>
</crx>
C:\Users\395152>