thanks to Fabian, I will try correcting it following your hint. Richard
At 2011-06-14 16:28:30，"Fabian Keil" <[email protected]> wrote: >Richard <[email protected]> wrote: > >> >> Hi, >> >> >> I have write a simple program based on libcur, it simpley download data and >> write to a local file. >> In most of the cases, it works fine, but some special case, it works >> differently from linux curl command. >> >> The main part of my program looks like this: >> ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// >> 62 CURL* handler = curl_easy_init(); >> 65 int ret = CURLE_OK; >> 266 ret += curl_easy_setopt(handler, CURLOPT_ERRORBUFFER, errBuffer); >> 267 ret += curl_easy_setopt(handler, CURLOPT_VERBOSE, 1); >> 268 ret += curl_easy_setopt(handler, CURLOPT_URL, url); >> >> 270 ret += curl_easy_setopt(handler, CURLOPT_WRITEFUNCTION, >> write_image_data); >> 271 ret += curl_easy_setopt(handler, CURLOPT_WRITEDATA, imgData); >> >> 273 ret += curl_easy_perform(handler); >> /////////////////////////////////////////////////////////////////////////////////////////////////////////////////// >> >> In a special case, this url: >> http://www.my7475.com/wp-content/uploads/2008/09/my747508093002.jpg >> My program fails in getting image, the printed out message looks like this: >> //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// >> * About to connect() to www.my7475.com port 80 >> * Trying 119.57.53.145... * connected >> * Connected to www.my7475.com (119.57.53.145) port 80 >> > GET /wp-content/uploads/2008/09/my747508093002.jpg HTTP/1.1 >> Host: www.my7475.com >> Accept: */* >> >> < HTTP/1.1 500 Internal Server Error >> < Date: Tue, 14 Jun 2011 07:44:48 GMT >> < Server: Apache/2.2.15 (Unix) PHP/5.2.13 >> < Content-Length: 535 >> < Connection: close >> < Content-Type: text/html; charset=iso-8859-1 >> * Closing connection #0 >> download size: 535 >> //////////////////////////////////////////////////////////////////////////////////////////////////////////////// >> I checked the downloaded content, it is just a text message telling me >> internal server error. >> But if I use curl with default option and verbose mode, it download the >> image succesfully >> and print out message like this: >> /////////////////////////////////////////////////////////////////////////////////////////////////////////////// >> * About to connect() to www.my7475.com port 80 >> * Trying 119.57.53.145... connected >> * Connected to www.my7475.com (119.57.53.145) port 80 >> > GET /wp-content/uploads/2008/09/my747508093002.jpg HTTP/1.1 >> > User-Agent: curl/7.15.5 (x86_64-redhat-linux-gnu) libcurl/7.15.5 >> > OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5 >> > Host: www.my7475.com >> > Accept: */* >> > >> < HTTP/1.1 200 OK >> < Date: Tue, 14 Jun 2011 07:46:22 GMT >> < Server: Apache/2.2.15 (Unix) PHP/5.2.13 >> < Last-Modified: Fri, 19 Mar 2010 12:46:33 GMT >> < ETag: "19689e6-5a17-48226bcb21c40" >> < Accept-Ranges: bytes >> < Content-Length: 23063 >> < Content-Type: image/jpeg >> % Total % Received % Xferd Average Speed Time Time Time >> Current >> Dload Upload Total Spent Left Speed >> 100 23063 100 23063 0 0 6216 0 0:00:03 0:00:03 --:--:-- >> 410kConnection #0 to host www.my7475.com left intact >> >> * Closing connection #0 >> ////////////////////////////////////////////////////////////////////////////////////////////////////////////// >> >> From the above two verbose messages, it is really hard for me to figure out >> what is wrong. > >The server seems to be expecting an User-Agent: > >fk@r500 ~ $curl --head >'http://www.my7475.com/wp-content/uploads/2008/09/my747508093002.jpg' >HTTP/1.1 200 OK >Date: Tue, 14 Jun 2011 08:27:27 GMT >Server: Apache/2.2.15 (Unix) PHP/5.2.13 >Last-Modified: Sat, 12 Feb 2011 02:53:52 GMT >ETag: "19689e6-5a17-48226bcb21c40" >Accept-Ranges: bytes >Content-Length: 23063 >Keep-Alive: timeout=10, max=100 >Connection: Keep-Alive >Content-Type: image/jpeg >Proxy-Connection: keep-alive > >fk@r500 ~ $curl -H 'User-Agent:' --head >'http://www.my7475.com/wp-content/uploads/2008/09/my747508093002.jpg' >HTTP/1.1 500 Internal Server Error >Date: Tue, 14 Jun 2011 08:27:41 GMT >Server: Apache/2.2.15 (Unix) PHP/5.2.13 >Connection: close >Content-Type: text/html; charset=iso-8859-1 >Proxy-Connection: keep-alive > >Fabian
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