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curl with Variable Substitution in a GraphQL Request Body

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This example shows how to use variables inside a graphql request body using the {{variable_name}} syntax. When the HTTP request’s Content-Type indicates graphql, Chilkat automatically applies proper escaping to each substituted value, ensuring the resulting graphql remains valid. AutoIt

Local $bSuccess = False

$bSuccess = False

; Variable names are enclosed between {{ and }}
; Important: Variables should be placed inside the quotes.

; curl -X POST https://api.example.com/graphql \
;   -H "Content-Type: application/graphql; charset=utf-8" \
;   -H "Accept: application/json" \
;   --data-binary "mutation {
;   createUser(
;     input: {
;       name: \"{{name}}\"
;       city: \"{{city}}\"
;       note: \"{{note}}\"
;       bio: \"{{bio}}\"
;     }
;   ) {
;     id
;     name
;   }
; }"

; Build the above curl command.
$oSbCurl = ObjCreate("Chilkat.StringBuilder")
$oSbCurl.AppendLn("curl -X POST https://api.example.com/graphql \")
$oSbCurl.AppendLn("  -H ""Content-Type: application/graphql; charset=utf-8"" \")
$oSbCurl.AppendLn("  -H ""Accept: application/json"" \")
$oSbCurl.AppendLn("  -d ""mutation {")
$oSbCurl.AppendLn("  createUser(")
$oSbCurl.AppendLn("    input: {")
$oSbCurl.AppendLn("      name: \""{{name}}\""")
$oSbCurl.AppendLn("      city: \""{{city}}\""")
$oSbCurl.AppendLn("      note: \""{{note}}\""")
$oSbCurl.AppendLn("      bio: \""{{bio}}\""")
$oSbCurl.AppendLn("    }")
$oSbCurl.AppendLn("  ) {")
$oSbCurl.AppendLn("    id")
$oSbCurl.AppendLn("    name")
$oSbCurl.AppendLn("  }")
$oSbCurl.AppendLn("}""")

$oCurl = ObjCreate("Chilkat.HttpCurl")

; Provide values for variables
$oCurl.SetVar "name","José O'Connor"
$oCurl.SetVar "city","München"
$oCurl.SetVar "note","He said ""Hello, world!"" — and left…"
$oCurl.SetVar "bio","Loves sushi, café visits, and π ≈ 3.14159"

; To demonstrate how the variables are replaced, this example does not execute the curl command. 
; Instead, it generates the raw HTTP request that would be sent if the curl command were run.
$oSbRawRequest = ObjCreate("Chilkat.StringBuilder")
$bSuccess = $oCurl.ToRawRequest($oSbCurl.GetAsString(),$oSbRawRequest)
If ($bSuccess = False) Then
    ConsoleWrite($oCurl.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite($oSbRawRequest.GetAsString() & @CRLF)

; The output is shown below.
; Notice the quote chars around "Hello, world!" are properly escaped.

; POST /graphql HTTP/1.1
; Accept: application/json
; Host: api.example.com
; Content-Type: application/graphql; charset=utf-8
; Content-Length: 250
; 
; mutation {
;   createUser(
;     input: {
;       name: "José O'Connor"
;       city: "München"
;       note: "He said \"Hello, world!\" — and left…"
;       bio: "Loves sushi, café visits, and π ≈ 3.14159"
;     }
;   ) {
;     id
;     name
;   }
; }