httpie.md: add page

pages/linux/httpie.md

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+# httpie
+
+> A human-friendly CLI HTTP tool.
+
+- GET method (default method with no request data):
+
+`http {{https://api.github.com/users}}`
+
+- POST method (default method with request data):
+
+`http {{example.org}} {{hello=World}}`
+
+- POST method with redirected input:
+
+`http {{example.org}} < {{file.json}}`
+
+- PUT method:
+
+`http PUT {{httpbin.org/put}} {{API-Key:foo hello=world}}`
+
+- DELETE method:
+
+`http DELETE {{example.org/todos/7}}`
+
+- Show the whole HTTP exchange (request and response):
+
+`http -v {{example.org}}`
+
+- Download file:
+
+`http --download {{example.org}}`