PureBasic

Send a Staged REST Request from a StringBuilder

Demonstrates Rest.SendReqSb, which sends a request whose text body is read from a StringBuilder, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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PureBasic

IncludeFile "CkRest.pb"
IncludeFile "CkStringBuilder.pb"

Procedure ChilkatExample()

    success.i = 0

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    bTls.i = 1
    bAutoReconnect.i = 1
    success = CkRest::ckConnect(rest,"example.com",443,bTls,bAutoReconnect)
    If success = 0
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        ProcedureReturn
    EndIf

    CkRest::ckAddHeader(rest,"Content-Type","application/json")

    ;  Send a request whose text body is read from a StringBuilder.
    sbBody.i = CkStringBuilder::ckCreate()
    If sbBody.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckAppend(sbBody,"{ " + Chr(34) + "query" + Chr(34) + ": " + Chr(34) + "chilkat" + Chr(34) + " }")
    success = CkRest::ckSendReqSb(rest,"POST","/api/search",sbBody)
    If success = 0
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        CkStringBuilder::ckDispose(sbBody)
        ProcedureReturn
    EndIf

    ;  After sending, read the response status line and header fields.  The return value is the HTTP
    ;  status code, or -1 if no response was received.
    statusCode.i = CkRest::ckReadResponseHeader(rest)
    If statusCode < 0
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        CkStringBuilder::ckDispose(sbBody)
        ProcedureReturn
    EndIf

    Debug "Response status code: " + Str(statusCode)

    ;  Read the response body as text.
    responseBody.s = CkRest::ckReadRespBodyString(rest)
    If CkRest::ckLastMethodSuccess(rest) = 0
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        CkStringBuilder::ckDispose(sbBody)
        ProcedureReturn
    EndIf

    Debug responseBody


    CkRest::ckDispose(rest)
    CkStringBuilder::ckDispose(sbBody)


    ProcedureReturn
EndProcedure