new OpenAPI streaming chat example

Pwsh/OpenAI/Using-Streaming-Api-for-Chat-GPT.ps1

@@ -0,0 +1,44 @@
+<#
+about: using the ChatGPT Streaming API
+from: NoahP @  <https://discord.com/channels/180528040881815552/447476117629304853/1238630446695317624>
+
+see also:
+- https://platform.openai.com/docs/api-reference/streaming
+- https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events/Using_server-sent_events#event_stream_format#named_events
+
+#>
+
+$Message = "write a powershell script to send an email using graph API"
+$webrequest = [System.Net.HttpWebRequest]::Create("https://api.openai.com/v1/chat/completions")
+$Body = @{
+    "model"       = "gpt-3.5-turbo"
+    "top_p"       = 1
+    "temperature" = 0.7
+    "stream"      = $true
+    "messages"    = @(
+        @{
+            role    = "user"
+            content = $Message
+        }
+    )
+} | ConvertTo-Json
+$webrequest.Headers.Add("Authorization", "Bearer " + $Token )
+$RequestBody = [byte[]][char[]]$body
+$webrequest.Method = "POST"
+$webrequest.ContentType = 'application/json'
+$RequestStream = $webrequest.GetRequestStream()
+$RequestStream.Write($RequestBody, 0, $RequestBody.Length)
+
+$responseStream = $webrequest.GetResponse().GetResponseStream()
+$streamReader = [System.IO.StreamReader]::new($responseStream)
+do {
+    $chunk = $streamReader.ReadLine()
+    if ($chunk -notlike "*DONE*") {
+        $word = ($chunk -replace "^data:" | ConvertFrom-Json).choices.delta.content
+        Write-Host $Word -NoNewline
+    }
+    else {
+        "`n"
+    }
+}
+until ($chunk -like "*DONE*")