Tcl

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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Tcl


load ./chilkat.dll

set success 0

set rest [new_CkRest]

set bTls 1
set bAutoReconnect 1
set success [CkRest_Connect $rest "example.com" 443 $bTls $bAutoReconnect]
if {$success == 0} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    exit
}

CkRest_AddHeader $rest "Content-Type" "application/json"

#  Send a request whose text body is read from a StringBuilder.
set sbBody [new_CkStringBuilder]

CkStringBuilder_Append $sbBody "{ \"query\": \"chilkat\" }"
set success [CkRest_SendReqSb $rest "POST" "/api/search" $sbBody]
if {$success == 0} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkStringBuilder $sbBody
    exit
}

#  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.
set statusCode [CkRest_ReadResponseHeader $rest]
if {$statusCode < 0} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkStringBuilder $sbBody
    exit
}

puts "Response status code: $statusCode"

#  Read the response body as text.
set responseBody [CkRest_readRespBodyString $rest]
if {[CkRest_get_LastMethodSuccess $rest] == 0} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkStringBuilder $sbBody
    exit
}

puts "$responseBody"

delete_CkRest $rest
delete_CkStringBuilder $sbBody