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.NET Forum / ASP.NET / General / April 2008HTTPWebRequest - IO.Streamwriter and Mysterious Line Feed
I am using HTTPWebRequest to programatically send a HTTP POST request. I have a long string (400 characters): dim str as string = "xxxxx...." It is a value that is passed in the HTTP Post header. So I do something like this: Request = HttpWebRequest.Create(URL) Request.Type = "POST" IOWriter = New IO.StreamWriter(Request.GetRequestStream()) IOWriter.Write(PostData) dim Request As HttpWebRequest = Request.GetResponse() The request is sent properly but for some reason, a LINE FEED IS INSERTED INTO THE STR VARIABLE AFTER 80 CHARACTERS? This is bizarre. Has anyone come across something like this? I believe it must have something to do with the IO.Streamwriter but it really makes no sense. Can anyone help? TIA How do you know a LF/CR is being inserted into your str variable? Are you actually looking inside str, or are you assuming this from what was posted? If you are seeing LF/CR in str, then you should look at how you are populating the variable. If you are reading from a file, is the read routine assuming a line length of 80 and returning a LF/CR because you are using a read command designed to read input lines? It seems unlikely that the writer/streamwriter is modifying your input when it writes out. If you are seeing this in your posted output, then are you using something like .writeline that automatically appends CR/LF? If you are posting to another system (such as UNIX based) through a gateway, then check if the gateway is doing any character conversion that maybe responsible for the LF/CR. Yes, this was my first thought. But I am pretty certain that the CR/LF is not in the string variable when the Streamwriter is sent. I use VS2005 and I do a watch on that variable and I do not see any CR/LF in there. The only way that I know it is there is I have a HTTP monitoring program and I can see that when the request is sent, there are linefeeds in the HTTP header associated with that variable. Very wierd. > How do you know a LF/CR is being inserted into your str variable? Are > you actually looking inside str, or are you assuming this from what [quoted text clipped - 14 lines] > gateway, then check if the gateway is doing any character conversion > that maybe responsible for the LF/CR. Ok, I have found the problem but still need help with the solution. The large string that I was referring to has character sequences like "%0A" (which is a hex code for a line feed). So when I send that string in a HTTPWebRequest, the code converts that into a linefeed. Essentially, it automatically encodes it when I do not want it encoded. I know about server.urlencode, etc. Is that where I would find a solution? > How do you know a LF/CR is being inserted into your str variable? Are > you actually looking inside str, or are you assuming this from what [quoted text clipped - 14 lines] > gateway, then check if the gateway is doing any character conversion > that maybe responsible for the LF/CR. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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