On Sat, Oct 17, 2009 at 7:12 AM, Eugene Ossintsev <
eugoss@gmail.com> wrote:
> I use DRAKMA 1.0, Clozure CL 1.4-dev (Ubuntu Linux x86). According to
> the DRAKMA documentation, parameters is an alist of name/value pairs
> (the car and the cdr each being a string) which denotes the parameters
> which are added to the query part of the URI or (in the case of a POST
> request) comprise the request body.
>
> In my example QUOTES1 sends a GET request passing the request
> parameters in the URI, and QUOTES2 uses the :PARAMETERS instead. The
> results, unfortunately, are not the same.
>
>
> (defun quotes1 ()
> (multiple-value-bind (body code)
> (drakma:http-request
> "
http://finance.yahoo.com/d/quotes.csv?s=XIC.TO&f=sxl1d1t1")
> (when (= code 200)
> (split-sequence:split-sequence #\, body))))
>
> ("\"
XIC.TO\"" "\"Toronto\"" "18.03" "\"10/9/2009\"" "\"3:59pm\" ^M
> ") <=== It's fine :-)
>
>
> (defun quotes2 ()
> (multiple-value-bind (body code)
> (drakma:http-request "
http://finance.yahoo.com/d/quotes.csv"
> :method :get
> :parameters '(("s" . "
XIC.TO")
> ("f" . "sxl1d1t1")))
> (when (= code 200)
> (split-sequence:split-sequence #\, body))))
>
> ("\"
XIC.TO\"" "\"Toronto\"" "18.03" "\"10/9/2009\"" "\"3:59pm\""
> "\"
XIC.TO\"" "\"
XIC.TO\"" "\"
XIC.TO\"" "\"Toronto\"" "18.03"
> "\"10/9/2009\"" "\"3:59pm\" ^M
> \"
XIC.TO\"" "\"Toronto\"" "18.03" "\"10/9/2009\"" "\"3:59pm\""
> "\"
XIC.TO\"" "\"
XIC.TO\"" "\"
XIC.TO\"" "\"Toronto\"" "18.03"
> "\"10/9/2009\"" "\"3:59pm\" ^M
> ") <=== It's a mess :-(
>
>
> TRACE DRAKMA:HTTP-REQUEST shows that in case of redirects of GET
> requests the parameters from :PARAMETERS are added again to the URI.
> Thus, the same parameters may be added again and again, giving
> unpredictable results.
>
> 0> Calling (DRAKMA:HTTP-REQUEST
> "
http://finance.yahoo.com/d/quotes.csv" :PARAMETERS (("s" . "
XIC.TO")
> ("f" . "sxl1d1t1")))
> 1> Calling (DRAKMA:HTTP-REQUEST #<URI
>
http://download.finance.yahoo.com/d/quotes.csv?s=XIC.TO&f=sxl1d1t1>
> :REDIRECT 4 :STREAM NIL :ADDITIONAL-HEADERS NIL :PARAMETERS (("s" .
> "
XIC.TO") ("f" . "sxl1d1t1")))
> <1 DRAKMA:HTTP-REQUEST returned 7 values :
> <1 #(34 88 73 67 46 84 79 34 44 34 84 111 114 111 110 116 111 34
> 44 49 55 46 57 56 44 34 49 48 ..........
> <1 200
> <1 ((:DATE . "Wed, 14 Oct 2009 05:00:51 GMT") (:P3P .
> "policyref=\"
http://p3p.yahoo.com/w3c/p3p.xml\", CP=\"CAO DSP COR CUR
> ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi
> PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE
> GOV\"") (:CACHE-CONTROL . "private") (:CONNECTION . "close")
> (:TRANSFER-ENCODING . "chunked") (:CONTENT-TYPE .
> "application/octet-stream"))
> <1 #<URI
http://download.finance.yahoo.com/d/quotes.csv?s=XIC.TO&f=sxl1d1t1&s=XIC.TO&f=sxl1d1t1>
> <1 #<FLEXI-STREAMS:FLEXI-IO-STREAM #x15616B76>
> <1 T
> <1 "OK"
>
>
> Is it what may be expected from such usage of :PARAMETERS in GET
> requests? If not, is it worth fixing it?
>
>
> - Eugene
>