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问题:

If I set up a html page with the following form:

<html>
<body>

<form action="upload_file.php" method="post"
enctype="multipart/form-data">
<label for="file">Filename:</label>
<input type="file" name="file" id="file" /> 
<br />
<input type="submit" name="submit" value="Submit" />
</form>

</body>
</html>

I can upload a file to upload_file.php where I can handle it using a php script.

For testing purposes, I need to do the same using raw HTTP via a Putty session.

I can do a normal POST (just sending text data) this way:

POST /test_post.php HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 11

name=myname

How can I send a file this way?

回答1:

You have to use multipart content-type and encode the file data into hex/binary

Try the following in telnet:

POST /the_url HTTP/1.1
User-Agent: Mozilla
Host: www.example.com
Content-Length: xxxx
Content-Type: multipart/form-data; boundary=--------------------31063722920652
------------------------------31063722920652
Content-Disposition: form-data; name="a"

value_for_a
------------------------------31063722920652
Content-Disposition: form-data; name="b"

value_for_b
------------------------------31063722920652
Content-Disposition: form-data; name="c"; filename="myfile.txt"
Content-Type: text/plain

            This is a test 
            and more

-----------------------------31063722920652
Content-Disposition: form-data; name="submit"

Submit
-----------------------------31063722920652--

Remember that an extra newline is necessary between field name and its data. Also, update the Content-Length value.

回答2:

Open a port with netcat and save the incoming request:

nc -l -p 1090 > income-http.txt

Then modify your form to send the data to the netcat:

<form action="http://localhost:1090/upload_file.php" 
    method="post" enctype="multipart/form-data">

Submit the form from your browser. You can find the full raw request with the contents of the file in the income-http.txt file.

Saving the income-http.txt is an one-time activity. Later you can send the saved request out any times. Please note that you should edit the Host: header in the saved txt.