create xh.md

pages/common/xh.md

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+# xh
+
+> xh: Friendly and fast tool for sending HTTP requests
+> More information: <https://github.com/ducaale/xh>.
+
+- Send a GET request
+
+`xh httpbin.org/get`
+
+- Send a POST request with JSON body: `{"name": "ahmed", "age": 25}`
+
+`xh post httpbin.org/post name=john age:=25`
+
+- Send a GET request with querystring id=5&sort=true
+
+`xh get httpbin.org/get id==5 sort==true`
+
+- Send a GET request and include a header named x-api-key with value 12345
+
+`xh get httpbin.org/get x-api-key:12345`
+
+- Send a PUT request and pipe the result to less
+
+`xh put httpbin.org/put id:=49 age:=25 | less`
+
+- Download and save to res.json
+
+`xh -d httpbin.org/json -o res.json`