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Send HTTP POST request

The snippet shows how to send HTTP POST request to a web page and download the generated HTML result. The POST data is encoded as a byte array and written to the request stream of HttpWebRequest.

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open System.Text
open System.IO
open System.Net

// URL of a simple page that takes two HTTP POST parameters. See the
// form that submits there: http://www.snee.com/xml/crud/posttest.html
let url = "http://www.snee.com/xml/crud/posttest.cgi"

// Create & configure HTTP web request
let req = HttpWebRequest.Create(url) :?> HttpWebRequest 
req.ProtocolVersion <- HttpVersion.Version10
req.Method <- "POST"

// Encode body with POST data as array of bytes
let postBytes = Encoding.ASCII.GetBytes("fname=Tomas&lname=Petricek")
req.ContentType <- "application/x-www-form-urlencoded";
req.ContentLength <- int64 postBytes.Length
// Write data to the request
let reqStream = req.GetRequestStream() 
reqStream.Write(postBytes, 0, postBytes.Length);
reqStream.Close()

// Obtain response and download the resulting page 
// (The sample contains the first & last name from POST data)
let resp = req.GetResponse() 
let stream = resp.GetResponseStream() 
let reader = new StreamReader(stream) 
let html = reader.ReadToEnd()
namespace System
namespace System.Text
namespace System.IO
namespace System.Net
val url : string

Full name: Script.url
val req : HttpWebRequest

Full name: Script.req
type HttpWebRequest =
  inherit WebRequest
  member Abort : unit -> unit
  member Accept : string with get, set
  member AddRange : range:int -> unit + 7 overloads
  member Address : Uri
  member AllowAutoRedirect : bool with get, set
  member AllowWriteStreamBuffering : bool with get, set
  member AutomaticDecompression : DecompressionMethods with get, set
  member BeginGetRequestStream : callback:AsyncCallback * state:obj -> IAsyncResult
  member BeginGetResponse : callback:AsyncCallback * state:obj -> IAsyncResult
  member ClientCertificates : X509CertificateCollection with get, set
  ...

Full name: System.Net.HttpWebRequest
WebRequest.Create(requestUri: System.Uri) : WebRequest
WebRequest.Create(requestUriString: string) : WebRequest
property HttpWebRequest.ProtocolVersion: System.Version
Multiple items
type HttpVersion =
  new : unit -> HttpVersion
  static val Version10 : Version
  static val Version11 : Version

Full name: System.Net.HttpVersion

--------------------
HttpVersion() : unit
field HttpVersion.Version10
property HttpWebRequest.Method: string
val postBytes : byte []

Full name: Script.postBytes
type Encoding =
  member BodyName : string
  member Clone : unit -> obj
  member CodePage : int
  member DecoderFallback : DecoderFallback with get, set
  member EncoderFallback : EncoderFallback with get, set
  member EncodingName : string
  member Equals : value:obj -> bool
  member GetByteCount : chars:char[] -> int + 3 overloads
  member GetBytes : chars:char[] -> byte[] + 5 overloads
  member GetCharCount : bytes:byte[] -> int + 2 overloads
  ...

Full name: System.Text.Encoding
property Encoding.ASCII: Encoding
Encoding.GetBytes(s: string) : byte []
Encoding.GetBytes(chars: char []) : byte []
Encoding.GetBytes(chars: char [], index: int, count: int) : byte []
Encoding.GetBytes(chars: nativeptr<char>, charCount: int, bytes: nativeptr<byte>, byteCount: int) : int
Encoding.GetBytes(s: string, charIndex: int, charCount: int, bytes: byte [], byteIndex: int) : int
Encoding.GetBytes(chars: char [], charIndex: int, charCount: int, bytes: byte [], byteIndex: int) : int
property HttpWebRequest.ContentType: string
property HttpWebRequest.ContentLength: int64
Multiple items
val int64 : value:'T -> int64 (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.int64

--------------------
type int64 = System.Int64

Full name: Microsoft.FSharp.Core.int64

--------------------
type int64<'Measure> = int64

Full name: Microsoft.FSharp.Core.int64<_>
property System.Array.Length: int
val reqStream : Stream

Full name: Script.reqStream
HttpWebRequest.GetRequestStream() : Stream
HttpWebRequest.GetRequestStream(context: byref<TransportContext>) : Stream
Stream.Write(buffer: byte [], offset: int, count: int) : unit
Stream.Close() : unit
val resp : WebResponse

Full name: Script.resp
HttpWebRequest.GetResponse() : WebResponse
val stream : Stream

Full name: Script.stream
WebResponse.GetResponseStream() : Stream
val reader : StreamReader

Full name: Script.reader
Multiple items
type StreamReader =
  inherit TextReader
  new : stream:Stream -> StreamReader + 9 overloads
  member BaseStream : Stream
  member Close : unit -> unit
  member CurrentEncoding : Encoding
  member DiscardBufferedData : unit -> unit
  member EndOfStream : bool
  member Peek : unit -> int
  member Read : unit -> int + 1 overload
  member ReadLine : unit -> string
  member ReadToEnd : unit -> string
  ...

Full name: System.IO.StreamReader

--------------------
StreamReader(stream: Stream) : unit
StreamReader(path: string) : unit
StreamReader(stream: Stream, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(stream: Stream, encoding: Encoding) : unit
StreamReader(path: string, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(path: string, encoding: Encoding) : unit
StreamReader(stream: Stream, encoding: Encoding, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(path: string, encoding: Encoding, detectEncodingFromByteOrderMarks: bool) : unit
StreamReader(stream: Stream, encoding: Encoding, detectEncodingFromByteOrderMarks: bool, bufferSize: int) : unit
StreamReader(path: string, encoding: Encoding, detectEncodingFromByteOrderMarks: bool, bufferSize: int) : unit
val html : string

Full name: Script.html
StreamReader.ReadToEnd() : string
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More information

Link:http://fssnip.net/a7
Posted:5 years ago
Author:Tomas Petricek
Tags: net , internet , web , http , html , webrequest