feat: add httpc.Do & httpc.Service.Do (#1775)

* backup

* backup

* backup

* feat: add httpc.Do & httpc.Service.Do

* fix: not using strings.Cut, it's from Go 1.18

* chore: remove redudant code

* feat: httpc.Do finished

* chore: fix reviewdog

* chore: break loop if found

* add more tests

rest/httpc/vars.go

@@ -1,6 +1,17 @@
 package httpc
 
+import "errors"
+
 const (
+	pathKey         = "path"
+	formKey         = "form"
+	headerKey       = "header"
+	jsonKey         = "json"
+	slash           = "/"
+	colon           = ':'
 	contentType     = "Content-Type"
 	applicationJson = "application/json"
 )
+
+// ErrGetWithBody indicates that GET request with body.
+var ErrGetWithBody = errors.New("HTTP GET should not have body")