[racket] HTTP-POST byte string gets truncated

> validate-header validates the header as one string, but post-pure-port requires that the header is contained in a list of strings ("optional list of strings can be used to send header lines to the server"). Is there some kind of a mismatch between net/url and net/head?

Yes, unfortunately they represent headers differently. net/head
represents headers as a single "string" or #"bytes string" consisting
of \r\n separated elements. This is closest to the headers in real
life.  However net/url uses a list of elements (and they're "string"
elements only; not #"byte string").

Since you're using post-pure-port from net/url, I think you want:

(define header
  (list "Host: localhost:8080"
        "Connection: keep-alive"
        "User-Agent: Mozilla/5.0 (testClient.rkt 0.1)"
        "Accept-Encoding: gzip"
        "Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
        "Accept-Language: en-us"
        "Accept-Charset: ISO-8859-1,UTF-8;q=0.7,*;q=0.7"
        "Cache-control: no-cache"))
(post-pure-port my-url my-data header)


On Mon, Oct 8, 2012 at 3:07 AM, Mikko Tiihonen
<mikko.tiihonen at tmtiihonen.fi> wrote:
> Hi, Danny,
>
> the header is here:
>
> (define header (list (insert-field #"Host" #"localhost:8080"
>                                  (insert-field #"Connection" #"keep-alive"
>                                                (insert-field #"User-Agent" #"Mozilla/5.0 (testClient.rkt 0.1)"
>                                                              (insert-field #"Accept-Encoding" #"gzip"
>                                                                            (insert-field #"Accept" #"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
>                                                                                          (insert-field #"Accept-Language" #"en-us"
>                                                                                                        (insert-field #"Accept-Charset" #"ISO-8859-1,UTF-8;q=0.7,*;q=0.7"
>                                                                                                                      (insert-field #"Cache-control" #"no-cache" empty-header))))))))))
>
> For some reason the request struct on the server side seems to get the POST data four bytes off... I also noticed that empty-header does not evaluate to "\r\n\r\n" as specified in net/head documentation:
>> empty-header
> "\r\n"
>
> validate-header validates the header as one string, but post-pure-port requires that the header is contained in a list of strings ("optional list of strings can be used to send header lines to the server"). Is there some kind of a mismatch between net/url and net/head?
>
> Cheers,
>
> -Mikko
>
>
> On 8.10.2012, at 2:49, Danny Yoo wrote:
>
>> On Sat, Oct 6, 2012 at 4:50 AM, Mikko Tiihonen
>> <mikko.tiihonen at tmtiihonen.fi> wrote:
>>> Hi, again!
>>>
>>> I'm continuing to build a small HTTP-client. The problem is now that the POST parameter/value byte strings sent by put-pure-port and post-pure-port seem to get truncated somewhere. The request-post-data/raw shows that the byte string gets prepended with "\r\n\r\n" and truncated by four bytes. E.g.
>>>
>>> (post-pure-port uri #"param1=hello&param2=world" header)
>>>
>>> is received as
>>>
>>> #"\r\n\r\nparam1=hello&param2=w"
>>
>>
>> Odd.  What's the content of 'header' here?  It's the only free
>> variable I see whose value I don't quite understand yet.
>
>
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