A boundary marker is a delimiter used in multipart data transmissions, particularly in HTTP responses, to separate individual sections within a stream. This technique is commonly used in MJPEG video feeds, live image transmissions, and multi-part file uploads where multiple objects need to be sent over a single HTTP connection. The boundary marker is explicitly defined in the HTTP headers and serves as a way to identify the start and end of each transmitted object within the stream. To identify a boundary marker, you first need to look for Content-Type: multipart/x-mixed-replace in the HTTP headers. This indicates that the response contains multiple segments, each separated by a predefined boundary. Within the headers, you will typically see an entry like boundary=BoundaryString , where "BoundaryString" is the separator between individual content parts. When analysing the TCP stream, these boundary markers will appear before each image or file segment, commonly formatted as...
Used to extend the current dataset to columns as per the requirement. In this example, a new column named “ BootSince_newColumn ” is added to the output using the extend operator. This new variable calculates the time difference since boot time and now. The output shows the newly added column BootSince_newColumn with the value 2342, which is the number of hours since the boot time. For a more commonly applicable real world example, extend operator can be used to calculate the number of days since the last login date.