Message passing Background.html -> Content Script - google-chrome-extension

Question

I've got the following in my background.html to sendRequest to contentscript...
chrome.tabs.getSelected(null,function(tab)
{
chrome.tabs.sendRequest(tab.id,{req:"func"});
});
However, it doesn't appear to be working. What am I doing wrong?
Portion of related manifest file...
"background_page": "background.html",
"browser_action":
{
"default_icon": "icon.png",
"popup": "popup.html"
},
"permissions": [
"tabs",
"http://*/*",
"https://*/*",
"notifications",
"contextMenus"
],
"options_page": "options.html",
"content_scripts": [
{
"matches": ["http://*/*","https://*/*"],
"js": ["contentScript.js","jquery.js"],
"all_frames": false
}
],
contentscript...
chrome.extension.onRequest.addListener(
function(request, sender, sendResponse)
{
switch(request.req)
{
case "func":
func();
sendResponse({});
break;
default:
sendResponse({});
}
});

Answer 1

Make this in the background page :
chrome.tabs.getSelected(null,function(tab)
{
chrome.tabs.sendRequest(tab.id,{req:"func"}, function(response){
alert(response.req); // Get The response
});
});
And on the Content Script :
sendResponse({ req: 'Your Response' });
Also change your manifest to :
{
"background_page": "background.html",
"browser_action":
{
"default_icon": "icon.png",
"popup": "popup.html"
},
"permissions": [
"tabs",
"http://*/*",
"https://*/*",
"notifications",
"contextMenus"
],
"options_page": "options.html",
"content_scripts": [
{
"matches": ["http://*/*","https://*/*"],
"js": ["contentScript.js","jquery.js"],
"all_frames": false
}
],
"name" : "FirstExtension",
"version" : "1.0",
}
PS : Name and Version on the manifest are required...

Answer 2

Your code runs fine for me. Probably a content script is not loaded on that page when you are sending the request. Do you have some sort of condition before chrome.tabs.getSelected? You can't just run it right away, you need to be sure that a tab is loaded first.
PS. Also in your manifest you probably would want to load jquery before your content script.