Assets and other content are reflected through formatted strings, each of
which points to an online file or a file saved to the client's device. The
basic structure is a **protocol** followed by `://` and a **string** that
varies according to the protocol.

`[Protocol]://[String]`

<table>
  <thead>
        <tr>
            <th>Protocol</th>
            <th>String</th>
            <th>Description</th>
            <th>Example</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td><b>rbxassetid</b></td>
            <td>An existing asset ID</td>
            <td>Fetches a user-created asset uploaded to Roblox.</td>
            <td>rbxassetid://7229442422</td>
        </tr>
    <tr>
            <td><b>rbxasset</b></td>
            <td>A file path</td>
            <td>Fetches a file from Roblox's content folders.</td>
            <td>rbxasset://textures/face.png</td>
        </tr>
        <tr>
            <td><b>rbxthumb</b></td>
            <td>Parameters and values</td>
            <td>Allows for easy loading of thumbnails.</td>
            <td>rbxthumb://type=Asset&id=24813339&w=150&h=150</td>
        </tr>
    <tr>
            <td><b>rbxhttp</b></td>
            <td>A path on the Roblox website</td>
            <td>Fetches content from the Roblox website.</td>
            <td>rbxhttp://Thumbs/Avatar.ashx?x=100&y=100&format=png</td>
        </tr>
        <tr>
            <td><b>https</b>/<b>http</b></td>
            <td>A website URL</td>
            <td>Fetches content from a website using a URL.</td>
            <td>https://www.roblox.com/asset/?id=9723979220</td>
        </tr>
    </tbody>
</table>

For further guidance on using content, see
[Content Format Strings](/studio/asset-types#content-format-strings).


Content

A formatted string with a specific structure to reference some form of
content.


Default Value: {defaultValueStart}{defaultValueEnd}

This function returns immediately if possible, but can yield the thread that called it until it can return a value.

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This class is a top-level singleton. Retrieve an instance of this class with the GetService function.

Multiple threads can potentially write to this property, so it’s unsafe to read from unsynchronized threads.

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