Tcl

Creating an application/json HTTP POST Request

See more HTTP Examples

Demonstrates how to create an HTTP POST request having the Content-Type application/json, where the body of the HTTP request is the following JSON:

{
   "username" : "my_username",
   "password" : "my_password",
   "validation-factors" : {
      "validationFactors" : [
         {
            "name" : "remote_address",
            "value" : "127.0.0.1"
         }
      ]
   }
}

The generated HTTP request looks like this:

POST /something HTTP/1.1
Content-Type: application/json
Accept: application/json
Host: domain
Content-Length: 216

{
  "username": "my_username",
  "password": "my_password",
  "validation-factors": {
    "validationFactors": [
      {
        "name": "remote_address",
        "value": "127.0.0.1"
      }
    ]
  }
}

Tcl

load ./chilkat.dll

# This example demonstrates building an application/json request.

set req [new_CkHttpRequest]

# The ContentType, HttpVerb, and Path properties should
# always be explicitly set.
CkHttpRequest_put_HttpVerb $req "POST"
CkHttpRequest_put_Path $req "/something"
CkHttpRequest_put_ContentType $req "application/json"

# We may wish to add an "Accept" header to the request.
# This tells the server we'll accept an application/json response.
CkHttpRequest_AddHeader $req "Accept" "application/json"

# We'll use Chilkat's JSON API to create the JSON body of the HTTP request.
set json [new_CkJsonObject]

CkJsonObject_AppendString $json "username" "my_username"
CkJsonObject_AppendString $json "password" "my_password"

set vFactors [new_CkJsonObject]

CkJsonObject_AppendObject2 $json "validation-factors" $vFactors

set vArray [new_CkJsonArray]

CkJsonObject_AppendArray2 $vFactors "validationFactors" $vArray

set factorObj [new_CkJsonObject]

CkJsonArray_AddObjectAt2 $vArray 0 $factorObj
CkJsonObject_AppendString $factorObj "name" "remote_address"
CkJsonObject_AppendString $factorObj "value" "127.0.0.1"

# Use the JSON for the HTTP request body
# By default, the Emit method will output compact JSON.
# This is best for generating the smallest size request.
# To generate a more human-readable (pretty-printed) JSON request body,
# set the EmitCompact property to FALSE
CkJsonObject_put_EmitCompact $json 0
CkHttpRequest_LoadBodyFromString $req [CkJsonObject_emit $json] "utf-8"

# View the request that would be sent if HttpSReq was called:
set requestMime [CkHttpRequest_generateRequestText $req]
puts "$requestMime"

# A few important comments about the HTTP request that is generated:
# 
# 1) The Content-Length header is automatically generated based on the actual length of the MIME message
#    that follows the intial (topmost) MIME header.
# 2) The HOST header will automatically get filled in with the actual domain when HttpSReq
#    is called

delete_CkHttpRequest $req
delete_CkJsonObject $json
delete_CkJsonObject $vFactors
delete_CkJsonArray $vArray
delete_CkJsonObject $factorObj