Visual FoxPro

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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LOCAL lnSuccess
LOCAL loRest
LOCAL lnBTls
LOCAL lnBAutoReconnect
LOCAL loSbBody
LOCAL lnStatusCode
LOCAL lcResponseBody

lnSuccess = 0

loRest = CreateObject('Chilkat.Rest')
lnBTls = 1
lnBAutoReconnect = 1
lnSuccess = loRest.Connect("example.com",443,lnBTls,lnBAutoReconnect)
IF (lnSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

loRest.AddHeader("Content-Type","application/json")

*  Send a request whose text body is read from a StringBuilder.
loSbBody = CreateObject('Chilkat.StringBuilder')
loSbBody.Append('{ "query": "chilkat" }')
lnSuccess = loRest.SendReqSb("POST","/api/search",loSbBody)
IF (lnSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loSbBody
    CANCEL
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.
lnStatusCode = loRest.ReadResponseHeader()
IF (lnStatusCode < 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loSbBody
    CANCEL
ENDIF

? "Response status code: " + STR(lnStatusCode)

*  Read the response body as text.
lcResponseBody = loRest.ReadRespBodyString()
IF (loRest.LastMethodSuccess = 0) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loSbBody
    CANCEL
ENDIF

? lcResponseBody

RELEASE loRest
RELEASE loSbBody