The Headers View displays HTTP start-line and headers for the request and response of the item currently selected in the Testcase Editor. The Headers View is opened by selecting Window->Show View->Headers from the main menu.
The title of the item being displayed is shown in the upper left portion of the Headers View. If any modifiers are present on the HTTP Request header fields, the icon for the field in the Modifier column is active.

request-line and corresponding Edit button
header name
modifier column - an icon here indicates the header has a modifier configured
header value
Pressing the Edit button (1) will open the Edit HTTP Request-line/URL dialog below, which allows editing of the entire request-line, including the URL path and query parameters.
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Any of the Request or Response header values can be changed by double-clicking in the Value column and typing the new value. Request headers may also be edited using the modifier configuration (below).
Modifiers can be added, changed, or removed from HTTP request headers using the Edit HTTP header dialog, which is opened by double-clicking on the modifier icon. This dialog is similar to the Edit HTTP Request-line/URL dialog above - see the description for fields 6-8.

The status-line in the HTTP response may also be edited by clicking the Edit button:
