Improve the content type error message by showing available content types

[gitlw]

This change is 

[martinmr]

Reviewed 1 of 1 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @gitlw and @manishrjain)

---

dgraph/cmd/alpha/http.go, line 204 at r1 (raw file):

	default:
		x.SetStatus(w, x.ErrorInvalidRequest, "Unsupported content type. "+
			"Currently supported content types are application/json, application/graphqlpm")

minor: I think it's safe to remove the currently to make the message a bit shorter. It's implied that the message is referring to the current types.

[danielmai]

Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @gitlw and @manishrjain)

---

dgraph/cmd/alpha/http.go, line 203 at r1 (raw file):

	default:
		x.SetStatus(w, x.ErrorInvalidRequest, "Unsupported content type. "+

Let's keep the original spelling of "Content-Type" so it's clearer this is referring to the header name.

---

dgraph/cmd/alpha/http.go, line 331 at r1 (raw file):

	default:
		x.SetStatus(w, x.ErrorInvalidRequest, "Unsupported content type. "+

Let's keep the original spelling of "Content-Type" so it's clearer this is referring to the header name.

[gitlw]

Reviewable status: 0 of 1 files reviewed, 2 unresolved discussions (waiting on @danielmai, @manishrjain, and @martinmr)

---

dgraph/cmd/alpha/http.go, line 203 at r1 (raw file):

Previously, danielmai (Daniel Mai) wrote…

Let's keep the original spelling of "Content-Type" so it's clearer this is referring to the header name.

Done.

---

dgraph/cmd/alpha/http.go, line 331 at r1 (raw file):

Previously, danielmai (Daniel Mai) wrote…

Let's keep the original spelling of "Content-Type" so it's clearer this is referring to the header name.

Done.