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The Fiddler User Interface

Overview

The HTTP Sessions List

The HTTP Sessions list contains the list of HTTP Requests that are sent by your computer. You can resize and reorder the columns in this list for your convenience. You can also sort this list by clicking on the column header.

Certain key information is available in this list, including:

# - An ID# of the request generated by Fiddler for your convenience
Result - The Result code from the HTTP Response. Learn more...
Host - The hostname of the server to which the request was sent
URL - The path and file requested from the server
Body - The number of bytes in the Response body
Expires - Values from the Response's Expires or Cache-Control headers
Content-Type - The Content-Type header from the Response
User-Defined - A text field you can set via scripting. Learn more...

The default text coloring of the Session entries derives from the HTTP Status (red for errors, yellow for authentication demands), traffic type (CONNECT appears in grey), or response type (CSS in purple, HTML in blue; script in green, images in grey). You can override a session's text color using the ui-color flag in FiddlerScript.

Each session is marked with an icon for quick reference:

Request is being sent to the server

Downloading response from server

Request is paused at a breakpoint.

Response is paused at a breakpoint.

Response was HTML

Response was an image

Response was a script

Response was Cascading Style Sheet

Response was XML

Generic Response successful

Response was HTTP/300,301,302,303 or 307 redirect

Response was HTTP/304: Use cached version

Response was a request for client credentials

Response was a server error

Session was aborted by the client, Fiddler, or the Server.

Interacting with Sessions

If you right-click one or more sessions, a context-menu appears:

Tip: You can add to this menu using the ContextAction feature of FiddlerScript. Learn more...

On the Copy menu:

Session - Copy the raw session(s) to the clipboard in plaintext and colorized HTML format

Just URL - Copy the hostname + URL path

Headers Only - Copy the request and response headers to the clipboard in plaintext and colorized HTML format

Full Summary - Copy all columns in the session list to the clipboard in plaintext and HTML suitable for pasting into Excel

Terse Summary - Copy the request URL and the response Status to the clipboard

On the Save menu:

Everything to ZIP - Creates a .ZIP archive containing all selected requests & responses, plus an index page.

Session - Create a text file containing the request followed by the response

Headers Only - Create a text file containing the request and response headers

Full Request - Create a text file containing the request headers and request body

Request Body - Create a file containing the body of the request (generally HTTP POST data)

Full Response - Create a text file containing the response headers and response body

Response Body - Create a file contain the body of the response (often HTML or an image)

Timeline

The Timeline Tab shows the transfer timeline of selected HTTP Sessions. NOTE: You should enable Streaming Mode for the highest accuracy in Timeline rendering.

The vertical line indicates the time to first byte of the server's response.
The green circle before the bar shows that a connection was reused; a red circle means that the connection was newly created.
The green circle after the bar shows that the server didn't send a Connection: close header; a red circle means that the server sent Connection: close.
The gray arrow icon indicates that the server's response was a redirect (302). The red ! icon indicates that the server returned an error code (404).

timeline