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LWP::UserAgent Bad and Forbidden requests

by taioba (Novice)
on Dec 15, 2011 at 18:34 UTC ( #943806=perlquestion: print w/ replies, xml ) Need Help??
taioba has asked for the wisdom of the Perl Monks concerning the following question:

Venerable monks, if I use the following code to retrieve HTML from the following addresses (my browser displays them without a problem):

#! /usr/bin/perl use strict; use warnings; use LWP::UserAgent; my $url_1 = 'http://www.springerlink.com/content/w63801m75p4hr012/'; my $url_2 = 'http://www.sciencedirect.com/science/article/pii/S1439179 +111001204'; my $browser = LWP::UserAgent->new; for my $url ( $url_1, $url_2 ) { my $response = $browser->get( $url ); my $html = $response->is_success ? $response->content : warn $response->status_line; }

I get:

403 Forbidden at monks_sample.pl line 15. 400 Bad Request at monks_sample.pl line 15.

Any ideas? Thanx!

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Re: LWP::UserAgent Bad and Forbidden requests
by gman (Friar) on Dec 15, 2011 at 18:55 UTC
    Here is the response I get:

    " ScienceDirect.does.not.support.the.use.of.the crawler.software.If.you.have.any questions.please contact.your.helpdesk.."

    Could try changing your user agent type

    15:14:49.667268 IP web-editions.com.www > test.test.com.60155: Flags [ +P.], seq 1696:3144, ack 166, +win 4545, options [nop,nop,TS val 1125034391 ecr 518304537] + , length 1448 0x0000: 4500 05dc d2a0 4000 ee06 ed0d c651 c802 E.....@..... +.Q.. 0x0010: 976d a1ab 0050 eafb 1554 b73f 43ac 07c0 .m...P...T.? +C... 0x0020: 8018 11c1 c38f 0000 0101 080a 430e a997 ............ +C... 0x0030: 1ee4 b319 2f73 6369 6469 7269 6d67 2f6a ..../scidiri +mg/j 0x0040: 732f 7364 4c5f 636f 6d70 2e6a 7322 3e3c s/sdL_comp.j +s">< 0x0050: 2f73 6372 6970 743e 0a3c 7363 7269 7074 /script>.<sc +ript 0x0060: 2073 7263 3d22 2f73 6369 6469 7269 6d67 .src="/scidi +rimg 0x0070: 2f6a 732f 7364 582e 6a73 223e 3c2f 7363 /js/sdX.js"> +</sc 0x0080: 7269 7074 3e0a 3c73 6372 6970 7420 7372 ript>.<scrip +t.sr 0x0090: 633d 222f 7363 6964 6972 696d 672f 6a73 c="/scidirim +g/js 0x00a0: 2f73 642e 6a73 223e 3c2f 7363 7269 7074 /sd.js"></sc +ript 0x00b0: 3e0a 0a0a 3c21 2d2d 2073 7461 7469 6320 >...<!--.sta +tic. 0x00c0: 636f 6e73 7420 6368 6172 2067 656e 4572 const.char.g +enEr 0x00d0: 726f 7274 6d70 6c5f 7363 6373 4964 5b5d rortmpl_sccs +Id[] 0x00e0: 203d 2022 4028 2329 6765 6e45 7272 6f72 .=."@(#)genE +rror 0x00f0: 2e74 6d70 6c20 2020 342e 312e 322e 3120 .tmpl...4.1. +2.1. 0x0100: 2030 322f 3137 2f30 3020 3136 3a35 353a .02/17/00.16 +:55: 0x0110: 3138 2020 5265 7472 6965 7665 643a 2030 18..Retrieve +d:.0 0x0120: 322f 3232 2f30 3020 3039 3a30 313a 3338 2/22/00.09:0 +1:38 0x0130: 223b 202d 2d3e 0a3c 7469 746c 653e 0a0a ";.-->.<titl +e>.. 0x0140: 2020 0a0a 0a45 7272 6f72 0a0a 202d 2047 .....Error.. +.-.G 0x0150: 7565 7374 3c2f 7469 746c 653e 0a3c 2f68 uest</title> +.</h 0x0160: 6561 643e 0a0a 3c62 6f64 7920 6267 636f ead>..<body. +bgco 0x0170: 6c6f 723d 2223 6666 6666 6666 2220 7465 lor="#ffffff +".te 0x0180: 7874 3d22 2330 3030 3030 3022 3e0a 3c64 xt="#000000" +>.<d 0x0190: 6976 2073 7479 6c65 3d22 706f 7369 7469 iv.style="po +siti 0x01a0: 6f6e 3a72 656c 6174 6976 653b 223e 0a3c on:relative; +">.< 0x01b0: 6469 7620 6964 3d22 6865 6164 6572 2220 div.id="head +er". 0x01c0: 636c 6173 733d 226f 7574 6572 5772 6170 class="outer +Wrap 0x01d0: 7065 7222 3e0a 3c64 6976 2073 7479 6c65 per">.<div.s +tyle 0x01e0: 3d22 6261 636b 6772 6f75 6e64 2d63 6f6c ="background +-col 0x01f0: 6f72 3a23 4646 4646 4646 3b70 6f73 6974 or:#FFFFFF;p +osit 0x0200: 696f 6e3a 7265 6c61 7469 7665 3b7a 2d69 ion:relative +;z-i 0x0210: 6e64 6578 3a32 3b22 2063 6c61 7373 3d22 ndex:2;".cla +ss=" 0x0220: 6f75 7465 7257 7261 7070 6572 2220 3e0a outerWrapper +".>. 0x0230: 3c64 6976 2069 643d 226d 6173 7468 6561 <div.id="mas +thea 0x0240: 6422 3e0a 0a3c 212d 2d20 494e 5345 5254 d">..<!--.IN +SERT 0x0250: 5320 5448 4520 5445 4d50 4c41 5445 2056 S.THE.TEMPLA +TE.V 0x0260: 4152 4941 424c 4553 2050 4f50 554c 4154 ARIABLES.POP +ULAT 0x0270: 4544 2046 524f 4d20 4442 2066 6f72 2053 ED.FROM.DB.f +or.S 0x0280: 4349 5645 5253 4520 616e 6420 5052 4f44 CIVERSE.and. +PROD 0x0290: 5543 5420 6c61 6265 6c73 202d 2d3e 0a20 UCT.labels.- +->.. 0x02a0: 0a3c 6469 7620 6964 3d22 6c6f 676f 5344 .<div.id="lo +goSD 0x02b0: 223e 3c61 2068 7265 663d 222f 7363 6965 "><a.href="/ +scie 0x02c0: 6e63 653f 5f6f 623d 486f 6d65 5061 6765 nce?_ob=Home +Page 0x02d0: 5552 4c26 5f6d 6574 686f 643d 7573 6572 URL&_method= +user 0x02e0: 486f 6d65 5061 6765 265f 6c67 3d59 265f HomePage&_lg +=Y&_ 0x02f0: 7665 7273 696f 6e3d 3126 5f75 726c 5665 version=1&_u +rlVe 0x0300: 7273 696f 6e3d 3026 5f75 7365 7269 643d rsion=0&_use +rid= 0x0310: 3026 6d64 353d 3161 3264 3536 3837 6638 0&md5=1a2d56 +87f8 0x0320: 6633 3766 3666 3465 3832 3762 3930 6130 f37f6f4e827b +90a0 0x0330: 6366 6639 6465 2220 7461 7267 6574 3d22 cff9de".targ +et=" 0x0340: 5f74 6f70 223e 3c69 6d67 2073 7263 3d22 _top"><img.s +rc=" 0x0350: 2f73 6369 656e 6365 2f70 6167 652f 7374 /science/pag +e/st 0x0360: 6174 6963 2f73 6369 656e 6365 2f6c 6f67 atic/science +/log 0x0370: 6f2e 6769 6622 2074 6974 6c65 3d22 2d54 o.gif".title +="-T 0x0380: 6865 2077 6f72 6c64 2623 3339 3b73 206c he.world&#39 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......</div> +..</ 0x0480: 6469 763e 0a09 3c2f 6469 763e 0a0a 3c64 div>..</div> +..<d 0x0490: 6976 2069 643d 226e 6176 6967 6174 696f iv.id="navig +atio 0x04a0: 6e54 6f70 2220 636c 6173 733d 2263 6c65 nTop".class= +"cle 0x04b0: 6172 6669 7822 3e0a 2020 2020 2020 2020 arfix">..... +.... 0x04c0: 3c75 6c20 636c 6173 733d 226e 6176 206d <ul.class="n +av.m 0x04d0: 6169 6e22 3e0a 2020 2020 2020 2020 2020 ain">....... +.... 0x04e0: 2020 3c6c 6920 636c 6173 733d 226c 6173 ..<li.class= +"las 0x04f0: 7422 3e3c 6120 2068 7265 663d 222f 7363 t"><a..href= +"/sc 0x0500: 6965 6e63 653f 5f6f 623d 486f 6d65 5061 ience?_ob=Ho +mePa 0x0510: 6765 5552 4c26 5f6d 6574 686f 643d 7573 geURL&_metho +d=us 0x0520: 6572 486f 6d65 5061 6765 265f 6274 6e3d erHomePage&_ +btn= 0x0530: 5926 5f76 6572 7369 6f6e 3d31 265f 7572 Y&_version=1 +&_ur 0x0540: 6c56 6572 7369 6f6e 3d30 265f 7573 6572 lVersion=0&_ +user 0x0550: 6964 3d30 266d 6435 3d31 6132 6435 3638 id=0&md5=1a2 +d568 0x0560: 3766 3866 3337 6636 6634 6538 3237 6239 7f8f37f6f4e8 +27b9 0x0570: 3061 3063 6666 3964 6522 2074 6172 6765 0a0cff9de".t +arge 0x0580: 743d 225f 746f 7022 206e 616d 653d 2248 t="_top".nam +e="H 0x0590: 6f6d 6522 2074 6974 6c65 3d22 486f 6d65 ome".title=" +Home 0x05a0: 2220 3e48 6f6d 653c 2f61 3e3c 2f6c 693e ".>Home</a>< +/li> 0x05b0: 0a20 2020 2020 2020 2020 2020 203c 6c69 ............ +.<li 0x05c0: 3e0a 0909 093c 6120 2068 7265 >....<a..hre 15:14:49.667273 IP test.test.com.60155 > web-editions.com.www: Flags [ +.], ack 3144, win 1275, optio +ns [nop,nop,TS val 518304548 ecr 1125034391], length 0 0x0000: 4500 0034 b40e 4000 4006 bf48 976d a1ab E..4..@.@..H +.m.. 0x0010: c651 c802 eafb 0050 43ac 07c0 1554 bce7 .Q.....PC... +.T.. 0x0020: 8010 04fb c793 0000 0101 080a 1ee4 b324 ............ +...$ 0x0030: 430e a997 C... 15:14:49.701008 IP web-editions.com.www > test.test.com.60155: Flags [ +P.], seq 3144:4468, ack 166, +win 4545, options [nop,nop,TS val 1125034426 ecr 518304548] + , length 1324 0x0000: 4500 0560 d2ee 4000 ee06 ed3b c651 c802 E..`..@....; +.Q.. 0x0010: 976d a1ab 0050 eafb 1554 bce7 43ac 07c0 .m...P...T.. +C... 0x0020: 8018 11c1 5760 0000 0101 080a 430e a9ba ....W`...... +C... 0x0030: 1ee4 b324 4272 6f77 7365 4c69 7374 5552 ...$BrowseLi +stUR 0x0040: 4c26 5f74 7970 653d 616c 6c26 5f61 7574 L&_type=all& +_aut 0x0050: 683d 7926 5f62 746e 3d59 265f 7665 7273 h=y&_btn=Y&_ +vers 0x0060: 696f 6e3d 3126 5f75 726c 5665 7273 696f ion=1&_urlVe +rsio 0x0070: 6e3d 3026 5f75 7365 7269 643d 3026 6d64 n=0&_userid= +0&md 0x0080: 353d 3964 3638 3561 3435 3332 3461 3834 5=9d685a4532 +4a84 0x0090: 6166 3233 6266 6563 6533 3530 6239 6536 af23bfece350 +b9e6 0x00a0: 3766 2220 7461 7267 6574 3d22 5f74 6f70 7f".target=" +_top 0x00b0: 2220 6e61 6d65 3d22 4272 6f77 7365 2220 ".name="Brow +se". 0x00c0: 2074 6974 6c65 3d22 4272 6f77 7365 2220 .title="Brow +se". 0x00d0: 3e42 726f 7773 653c 2f61 3e0a 0909 093c >Browse</a>. +...< 0x00e0: 2f6c 693e 0a09 0909 0a09 0909 3c6c 693e /li>........ +<li> 0x00f0: 3c61 2020 6872 6566 3d22 2f73 6369 656e <a..href="/s +cien 0x0100: 6365 3f5f 6f62 3d4d 6961 6d69 5365 6172 ce?_ob=Miami +Sear 0x0110: 6368 5552 4c26 5f6d 6574 686f 643d 7265 chURL&_metho +d=re 0x0120: 7175 6573 7446 6f72 6d26 5f62 746e 3d59 questForm&_b +tn=Y 0x0130: 265f 7665 7273 696f 6e3d 3126 5f75 726c &_version=1& +_url 0x0140: 5665 7273 696f 6e3d 3126 5f75 7365 7269 Version=1&_u +seri 0x0150: 643d 3026 6d64 353d 3033 3934 6239 3664 d=0&md5=0394 +b96d 0x0160: 6230 6630 6466 3538 3435 3535 3566 3135 b0f0df584555 +5f15 0x0170: 3532 6561 3137 6563 2220 7461 7267 6574 52ea17ec".ta +rget 0x0180: 3d22 5f74 6f70 2220 6e61 6d65 3d22 5365 ="_top".name +="Se 0x0190: 6172 6368 2220 7469 746c 653d 2253 6561 arch".title= +"Sea 0x01a0: 7263 6822 203e 5365 6172 6368 3c2f 613e rch".>Search +</a> 0x01b0: 3c2f 6c69 3e0a 0a0a 2020 2020 2020 3c6c </li>....... +..<l 0x01c0: 693e 3c61 2020 6872 6566 3d22 2f73 6369 i><a..href=" +/sci 0x01d0: 656e 6365 3f5f 6f62 3d55 7365 7253 7562 ence?_ob=Use +rSub 0x01e0: 7363 7269 7074 696f 6e55 524c 265f 6d65 scriptionURL +&_me 0x01f0: 7468 6f64 3d62 6567 696e 265f 6274 6e3d thod=begin&_ +btn= 0x0200: 5926 5f7a 6f6e 653d 546f 704e 6176 4261 Y&_zone=TopN +avBa 0x0210: 7226 5f6f 7269 6769 6e3d 265f 7665 7273 r&_origin=&_ +vers 0x0220: 696f 6e3d 3126 5f75 726c 5665 7273 696f ion=1&_urlVe +rsio 0x0230: 6e3d 3126 5f75 7365 7269 643d 3026 6d64 n=1&_userid= +0&md 0x0240: 353d 6336 6532 3839 3032 3636 3065 6236 5=c6e2890266 +0eb6 0x0250: 3135 3131 3831 3237 6636 3634 6535 6562 15118127f664 +e5eb 0x0260: 3230 2220 7461 7267 6574 3d22 5f74 6f70 20".target=" +_top 0x0270: 2220 6e61 6d65 3d22 6163 636f 756e 7422 ".name="acco +unt" 0x0280: 2074 6974 6c65 3d22 4d79 2073 6574 7469 .title="My.s +etti 0x0290: 6e67 7322 203e 4d79 2073 6574 7469 6e67 ngs".>My.set +ting 0x02a0: 733c 2f61 3e3c 2f6c 693e 0a0a 2020 2020 s</a></li>.. +.... 0x02b0: 2020 3c6c 693e 3c61 2020 6872 6566 3d22 ..<li><a..hr +ef=" 0x02c0: 2f73 6369 656e 6365 3f5f 6f62 3d4d 6961 /science?_ob +=Mia 0x02d0: 6d69 5344 4955 524c 265f 6d65 7468 6f64 miSDIURL&_me +thod 0x02e0: 3d6c 6973 7441 6c65 7274 7326 5f62 746e =listAlerts& +_btn 0x02f0: 3d59 265f 7a6f 6e65 3d54 6f70 4e61 7642 =Y&_zone=Top +NavB 0x0300: 6172 265f 6f72 6967 696e 3d26 5f76 6572 ar&_origin=& +_ver 0x0310: 7369 6f6e 3d31 265f 7572 6c56 6572 7369 sion=1&_urlV +ersi 0x0320: 6f6e 3d30 265f 7573 6572 6964 3d30 266d on=0&_userid +=0&m 0x0330: 6435 3d34 6338 3433 3264 3434 3835 6337 d5=4c8432d44 +85c7 0x0340: 6533 3131 6133 6336 3931 3531 6535 6634 e311a3c69151 +e5f4 0x0350: 6566 3022 2074 6172 6765 743d 225f 746f ef0".target= +"_to 0x0360: 7022 206e 616d 653d 2261 6c65 7274 2220 p".name="ale +rt". 0x0370: 7469 746c 653d 2241 6c65 7274 7322 203e title="Alert +s".> 0x0380: 4d79 2061 6c65 7274 733c 2f61 3e3c 2f6c My.alerts</a +></l 0x0390: 693e 0a0a 2020 2020 2020 2020 0920 2020 i>.......... +.... 0x03a0: 2020 2020 2020 2020 0a20 2020 2020 2020 ............ +.... 0x03b0: 203c 2f75 6c3e 0a20 2020 2020 2020 200a .</ul>...... +.... 0x03c0: 2020 2020 2020 2020 0a20 203c 2f64 6976 ...........< +/div 0x03d0: 3e0a 3c2f 6469 763e 0a0a 2020 0a20 2020 >.</div>.... +.... 0x03e0: 203c 7461 626c 6520 626f 7264 6572 3d30 .<table.bord +er=0 0x03f0: 2063 656c 6c70 6164 6469 6e67 3d30 2063 .cellpadding +=0.c 0x0400: 656c 6c73 7061 6369 6e67 3d30 2077 6964 ellspacing=0 +.wid 0x0410: 7468 3d22 3130 3025 223e 0a20 2020 203c th="100%">.. +...< 0x0420: 7472 3e3c 7464 2073 7479 6c65 3d22 7061 tr><td.style +="pa 0x0430: 6464 696e 672d 746f 703a 302e 3065 6d22 dding-top:0. +0em" 0x0440: 3e3c 6120 6e61 6d65 3d22 536b 6970 2042 ><a.name="Sk +ip.B 0x0450: 7574 746f 6e73 223e 3c2f 613e 3c2f 7464 uttons"></a> +</td 0x0460: 3e3c 2f74 723e 0a20 2020 203c 2f74 6162 ></tr>.....< +/tab 0x0470: 6c65 3e0a 2020 0a0a 0a0a 0a3c 6469 7620 le>........< +div. 0x0480: 6964 3d22 7364 4865 6164 6572 2220 636c id="sdHeader +".cl 0x0490: 6173 733d 226f 7574 6572 5772 6170 7065 ass="outerWr +appe 0x04a0: 7222 3e0a 3c64 6976 2073 7479 6c65 3d22 r">.<div.sty +le=" 0x04b0: 7769 6474 683a 3130 3025 223e 0a0a 0a0a width:100%"> +.... 0x04c0: 0a3c 2f64 6976 3e0a 3c64 6976 3e0a 5363 .</div>.<div +>.Sc 0x04d0: 6965 6e63 6544 6972 6563 7420 2064 6f65 ienceDirect. +.doe 0x04e0: 7320 6e6f 7420 7375 7070 6f72 7420 7468 s.not.suppor +t.th 0x04f0: 6520 7573 6520 6f66 2074 6865 2063 7261 e.use.of.the +.cra 0x0500: 776c 6572 2073 6f66 7477 6172 652e 2020 wler.softwar +e... 0x0510: 4966 2079 6f75 2068 6176 6520 616e 7920 If.you.have. +any. 0x0520: 7175 6573 7469 6f6e 7320 706c 6561 7365 questions.pl +ease 0x0530: 2063 6f6e 7461 6374 2079 6f75 7220 6865 .contact.you +r.he 0x0540: 6c70 6465 736b 2e0a 3c2f 6469 763e 0a0a lpdesk..</di +v>.. 0x0550: 3c2f 626f 6479 3e0a 3c2f 6874 6d6c 3e0a </body>.</ht +ml>. 15:14:49.701016 IP test.test.com.60155 > web-editi
    After changing the user agent I get this for the second URL; Also, might help you if you add Data::Dumper and view the output.
    my $response = $browser->get( $url ); print Dumper($response);
    <div class="errMsgText">Sorry, the requested document is unavailable +.Contact the Help Desk if the problem persists. [SD-007]</div>
Re: LWP::UserAgent Bad and Forbidden requests
by Anonymous Monk on Dec 15, 2011 at 19:10 UTC
      Hi Anonymous,

      In general, changing your user agent string to spoof Firefox, for example, is not a legitimate workaround. LWP::UserAgent is kind of a grey area, since you could use it to build interactive, as well as automated web applications. However, the folks at sciencedirect.com are clearly taking a hard line against it. If taioma chooses to spoof his user agent from a spider, and it is detected, he could get himself (and his whole company) banned.

      Cheers,

      Larry

        I agree that spoofing another user agent is an ugly hack, however setting an appropriate user agent is always a good idea:

        my $ua = LWP::UserAgent->new(agent => 'MyApp/0.1');

        In general, changing your user agent string to spoof Firefox, for example, is not a legitimate workaround.

        says who?

        and his whole company) banned.

        I am not a lawyer, I don't give legal advice

Re: LWP::UserAgent Bad and Forbidden requests
by 1arryb (Acolyte) on Dec 15, 2011 at 19:27 UTC

    Hi taioba,

    You have run afoul of the Robots Exclusion Protocol. Many websites prefer that real humans with real eyeballs to visit their site. Some feel strongly enough to ban software "robots" such as LWP::UserAgent. Sciencedirect.com is one of these. If you look at the robots.txt file for sciencedirect.com, you'll see they only let the big boys (Google, et. al.) spider their site. All others (including you) can go suck rocks. There is no (legit) solution to this problem except to call the webmasters and convince them that it is in their interest to allow your program to crawl their site. Good luck with that. Alternatively, see if the site has an RSS data feed or API that provides the data you need. APIs especially are less subject to interdiction by webmasters, since they are designed for program-to-program integration.

    Cheers,

    Larry

        Hi Corion,

        True, but...all LWP::RobotUA gets you is a) client side processing of robot rules (i.e., once the user agent has downloaded robots.txt for a site, it will abort a banned url before making the request; and b) an optional, configurable delay between requests so your program can be a good "netizen" and avoid hammering websites too hard. None of this prevents the web server from evaluating your user agent identification string and processing its robot rules to accept or reject your request.

        Cheers,

        Larry

      Thanks Larry and everybody else for your help. ScienceDirect indeed has an API and RSS feeds, so I guess I'll have to re-hack my code and make sure I go down the legit path. Wish y'all Happy Holidays at the monastery!

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