Update cheatsheets

httpflow

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# httpflow
+
+> A command-line utility to capture and dump HTTP streams.
+> More information: <https://github.com/six-ddc/httpflow>.
+
+- Capture traffic on all interfaces:
+
+`httpflow -i {{any}}`
+
+- Use a bpf-style capture to filter the results:
+
+`httpflow {{host httpbin.org or host baidu.com}}`
+
+- Use a regular expression to filter requests by URLs:
+
+`httpflow -u '{{regular_expression}}'`
+
+- Read packets from pcap format binary file:
+
+`httpflow -r {{out.cap}}`
+
+- Write the output to a directory:
+
+`httpflow -w {{path/to/directory}}`