E07792: Web Service type HTTPContext can only be used by itself

What went wrong

You have HTTPContext parameter alongside other parameters, but HTTPContext must be the only parameter when used. It provides the full request context so individual bindings are redundant.

Worked examples

Compilable examples demonstrating this error and the correct fix:

• ek9 -q 1330 (Why can't I mix HTTPContext with QUERY or PATH paramet...)

How to fix it

1. Use HTTPContext alone - extract values from it inside method
2. Or use individual parameters without HTTPContext

The [EXAMPLE] section below shows a CONTEXT parameter beside a QUERY one, and the context taken alone.

Common causes

• Mixing HTTPContext with :=: QUERY/:=: PATH parameters
• Trying to have both context and individual params

See also

• E07792: HTTPContext mixed with other params (this error)
• E07791: Wrong type for CONTEXT
• E07780: Similar - HTTPRequest mixed with other params

Examples

Every example is compiled by the EK9 compiler: the first fails exactly as captioned, the others fix it.

Fails with E07792: Web Service type HTTPContext can only be used by itself

#!ek9
defines module error.e07792.bad

  defines class

    TextResponse with trait of HTTPResponse
      text as String?

      default private TextResponse()

      TextResponse()
        -> body as String
        this.text: body

      override contentType() as pure
        <- rtn as String: "text/plain"

      override content()
        <- rtn as Bytes: Bytes().withUtf8(text)

      override status() as pure
        <- rtn as Integer: 200

      default operator ?

  defines service

    Addresses for :/addresses open

      info() as GET for :/info
        ->
          //The context already holds every query value
          context as HTTPContext :=: CONTEXT
          filter as String :=: QUERY "q"
        <- response as HTTPResponse: TextResponse(`${context} ${filter}`)

Fixed: Take the context alone

#!ek9
defines module error.e07792.good

  defines class

    TextResponse with trait of HTTPResponse
      text as String?

      default private TextResponse()

      TextResponse()
        -> body as String
        this.text: body

      override contentType() as pure
        <- rtn as String: "text/plain"

      override content()
        <- rtn as Bytes: Bytes().withUtf8(text)

      override status() as pure
        <- rtn as Integer: 200

      default operator ?

  defines service

    Addresses for :/addresses open

      info() as GET for :/info
        -> context as HTTPContext :=: CONTEXT
        <- response as HTTPResponse: TextResponse($context)

Questions and answers

These Q&A entries show E07792 and its fix:

• Q1330: Why can't I mix HTTPContext with QUERY or PATH parameters in an EK9 service method?