The Fiddler User Interface
Overview
The Web Sessions List
The Web 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...
- Protocol - The Protocol (HTTP/HTTPS/FTP) used
by this session
- 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
- Caching - Values from the Response's Expires or
Cache-Control headers
- Process - The local Windows Process from which
the traffic originated
- Content-Type - The Content-Type header from the Response
- Custom - A text field you can set via scripting.
Learn more...
- Comments - A text field you can set from
scripting or the session's context menu
In Fiddler v2.2.0.5 and later, you can add new columns of your choice.
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:
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Request is being sent to the server |
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Downloading response from server |
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Request is paused at a breakpoint. |
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Response is paused at a
breakpoint. |
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Response was HTML |
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Response was an image |
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Response was a script |
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Response was Cascading Style Sheet |
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Response was XML |
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Generic Response successful |
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Response was HTTP/300,301,302,303 or 307 redirect |
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Response was HTTP/304: Use cached version |
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Response was a request for client credentials |
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Response was a server error |
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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:
- Session > In ArchiveZIP - Creates a .SAZ 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)
AutoResponder
The AutoResponder tab allows you to return locally stored content instead of
forwarding requests to the server.
Learn more...
Inspectors
The Inspectors tab allows you to view the contents of each request
and response, in a variety of different formats. You can
develop custom Inspectors using .NET.
Filters
The Filters tab enables
you to quickly filter out traffic that is not of interest. Learn more...
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).
Request Builder
The Request Builder allows you to craft custom requests to send to the
server. You can either create a new request manually, or you can
drag and drop a session from the Web Sessions list to create a new request
based on the existing request.
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