POST HTTP request to login with username and password with Java script and c++

I have been developing an application with C++ and some parts require connection to http servers, I managed to send GET and HEAD requests and retrieve the webpage.

Currently, I'm trying to send a POST request form to a website that requires login in informations, It is similar to the GET request, however, I don't know how to write it.

let's say:

POST /users/login HTTP/1.1
HOST: www.example.com
Content-Length: 50, 
username: ME
password: pass

and then receive authentication to retrieve login required pages,

How can I write my POST request!?

The website uses a form authentication. I mean there is a box to ente开发者_C百科r the email address and a password and then hit submit. to my knowledge it is written in JS.

Any help or direction is appreciated.

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Try rewriting your request as:

POST /users/login HTTP/1.1
HOST: www.example.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 25

username=ME&password=pass

I think '25' is the correct length.

As an exercise you could download HTTP tools that allow debugging like WireShark and then log in to a general forum that doesn't have secure log in systems like those typically used with phpbb forums.

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The POST is one among the http methods like GET,HEAD etc., Few basics regarding the the HTTP itself. It is a text based protocol (You can connect to port 80 of the server using a telnet client like putty and type the whole request by hand).

The first line contains the method (GET,HEAD,POST etc.,) the URL path and the HTTP protocol version you support. I recommend to use HTTP1.0 since you wont send multiple request within the same connection. This is harder to implement.

The next set of lines are called headers each line contains a key(content-type,content-length, host etc.,) and a value separated by a ':'.

Then whatever is sent is the body of the request. The information has to be urlencoded. Read through http://www.w3schools.com/tags/ref_urlencode.asp

Now coming to your problem if you already know how to perform GET then with that assumption for a POST following steps are required.

1. The request will be "POST HTTP/1.0"
2. Send atleast these headers

Content-Type: application/x-www-form-urlencoded Content-Length:

1. As body send the urlencoded text containing the inputname1=value1&inputname2=valule2
2. Now you should get the information back from the server.

Hope this helps. If you want to know more read through the http://www.w3.org/Protocols/HTTP/1.0/draft-ietf-http-spec.html