iOS OTA build not downloading

Question

It's a little weird problem. Today i built new version of my iOS application for OTA distribution. After downloading suddenly it says "Unable to Download App, 'ABC' could not be downloaded at this time". But the weird thing is it works if i use xCode "Devices" tool to install the same ipa file. I checked, double checked below things and still it's not working.

1. Recreated new provisioning profile.
2. Add different device and created new provisioning profile.
3. Use different mac to build the application.
4. Use different Apple developer account to build the app.(Created app id, prov profile, etc...)
5. Even i created an empty application to see if i modified any build settings by mistake.
6. Regenerated manifest.plist file.
7. Checked the html file to see if i linked to correct plist file.
8. Also server has valid SSL certificate installed.

This is my manifest.plist file,

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>items</key>
    <array>
        <dict>
            <key>assets</key>
            <array>
                <dict>
                    <key>kind</key>
                    <string>software-package</string>
                    <key>url</key>
                    <string>https://example.com/app/abc.ipa</string>
                </dict>
                <dict>
                    <key>kind</key>
                    <string>display-image</string>
                    <key>url</key>
                    <string>https://example.com/app/</string>
                </dict>
                <dict>
                    <key>kind</key>
                    <string>full-size-image</string>
                    <key>url</key>
                    <string>https://example.com/app/</string>
                </dict>
            </array>
            <key>metadata</key>
            <dict>
                <key>bundle-identifier</key>
                <string>com.example.ap</string>
                <key>bundle-version</key>
                <string>1.0</string>
                <key>kind</key>
                <string>software</string>
                <key>title</key>
                <string>ABC</string>
            </dict>
        </dict>
    </array>
</dict>
</plist>

And this is my html link,

<a href="itms-services://?action=download-manifest&url=https://www.example.com/app/manifest.plist">Tap Here to Install ABC Application</a>

Answer 1

I sorted out the problem. Actually that's a silly one :)

The only mistake i did was not adding 'www', It works fine once i add it.

I had to use "https://www.exam....." everywhere.