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httpmon provides both quick substring filtering and advanced filter expressions to narrow down captured flows.
httpmon filtering

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Quick filter

Press / in the flow list to focus the filter bar. Type any text to perform a case-insensitive substring match against the host and path of each flow.

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Advanced filter expressions

For more precise filtering, use structured expressions. Separate multiple terms with spaces to combine them with AND logic.
ExpressionDescription
s:200Exact status code
s:2xxStatus code range (2xx, 4xx, 5xx)
m:GETHTTP method
m:POSTHTTP method
ct:jsonContent-type contains substring
ct:htmlContent-type contains substring
re:patternRegex match on host+path
!termNegate any filter term

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Examples

Filter all successful GET requests: 
s:2xx m:GET
Filter JSON responses, excluding client errors: 
ct:json !s:4xx
Filter URLs matching a regex pattern: 
re:api/v[23]

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Learn more

See the filter syntax reference for the full list of operators and pattern rules.