Reference information about the default HTTP attribute groups.
The two attribute groups that are created by the HTTP
data source are:
- Managed URLs
- The Managed URLs table provides availability and response time data about each URL being monitored.
- URL Objects
- The URL Objects table contains a separate URL entry for each embedded object. For example, the .gif and .jpg files that might be used in the website that is listed in the Managed URL report.
When you want to monitor the response time and availability
of specific objects within a website, review the contents of the URL
Objects table. The URL Objects table monitors a specific list of objects
that are detected in downloaded HTML files. The following table lists
the HTML elements that are searched for objects to monitor and the
attributes within these elements that reference the objects:
In the following example HTML extract, the object that is
monitored is the image that is referenced by the src attribute of the imgelement.
| HTML element | Attribute containing object to be monitored |
|---|---|
| img | src |
| script | src |
| embed | src |
| object | codebase or data |
| body | background |
| input | src |
<img src="/v8/images/id-w3-sitemark-simple.gif" alt="" width="54" height="33" /> Note: If you do not want to monitor objects that are found
in a web page, in the URL Monitoring configuration section, set the Page object collection property to No.
Specific fields for HTTP attributes
Figure 1. Attribute
Information page
In the Attribute information page (Figure 1), there are two
fields for HTTP attributes that define how data is collected from
the URL. The Attribute Type field can be any
value from a list that controls the information about the URL that
is returned. Some attribute types require a value in the Type Value field.The following table describes
all of the attribute types for the Managed URLs attribute group, and
the type value when one is required:
| Attribute type | Description | Type value | Data type that is returned | Differences with FTP and file protocols |
|---|---|---|---|---|
| XPath Query | Runs an XPath query on the content that is returned from a URL connection. The query must be written to return data useful for an attribute, not a list of nodes. | The XPath query to run against the content that is obtained from a URL connection. | The data that is returned can be a string, a numeric, or a timestamp value. If the data is in the XML DateTime format, you can specify timestamp as the attribute type. The agent converts the value to a Candle Timestamp. | None |
| Response Time | The amount of time in milliseconds that it took to download the content from the requested URL. | None | Integer (number of milliseconds) | None |
| Response Message | The HTTP response message that is returned by the server. | None | String | The response message applies only if the URL uses the HTTP or HTTPS protocols. |
| Response Code | The HTTP response code that is returned by the server. | None | Integer | The response code applies only if the URL uses the HTTP or HTTPS protocols. It is always 0 for file or FTP URLs. |
| Response Length | The size of the content in bytes that is downloaded from the requested URL | None | Integer (size in bytes) | None |
| Response Header | The response header can be used to retrieve a value from one of the URL response header fields. The argument specifies which field is requested. | The response header to collect. | String | Generally FTP and file protocols do not have any headers that can be collected. |
| Request URL | The connection is made to this URL. All of the response keywords provide information about the connection to this URL. The XPath Query can be used to obtain information that is obtained from the content that is returned by accessing this URL. | None | String | None |
| Page Objects | The number of objects that are discovered on the monitored HTML page that are monitored by the URL Objects attribute group. | None | Integer | None |
| Total Object Size | The total size of the objects that is monitored in the URL Objects attribute group for this web page. | None | Integer (in bytes) | None |
| Alias | The user specified alias for this URL. | None | String | None |
| User | The user specified data for this URL. | None | String | None |
The following table describes the attribute types
for the URL Objects attribute group:
| Attribute type | Description | Type value | Data type that is returned | Differences with FTP and file protocols |
|---|---|---|---|---|
| URL | The URL that is monitored in the Managed URLs table. | None | String | None |
| Object Name | The URL for the object that is monitored within the HTML page. | None | String | None |
| Object Size | The size in bytes of the content that is downloaded from the Object Name URL. | None | Numeric | None |
| Object Response Time | The time in milliseconds it took to download the page object. | None | Numeric | None |