src/net/base/mime_sniffer_unittest.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/basictypes.h"
   6 #include "net/base/mime_sniffer.h"
   7 #include "testing/gtest/include/gtest/gtest.h"
   8 #include "url/gurl.h"
   9
  10 namespace net {
  11
  12 struct SnifferTest {
  13   const char* content;
  14   size_t content_len;
  15   std::string url;
  16   std::string type_hint;
  17   const char* mime_type;
  18 };
  19
  20 static void TestArray(SnifferTest* tests, size_t count) {
  21   std::string mime_type;
  22
  23   for (size_t i = 0; i < count; ++i) {
  24     SniffMimeType(tests[i].content,
  25                        tests[i].content_len,
  26                        GURL(tests[i].url),
  27                        tests[i].type_hint,
  28                        &mime_type);
  29     EXPECT_EQ(tests[i].mime_type, mime_type);
  30   }
  31 }
  32
  33 // TODO(evanm): convert other tests to use SniffMimeType instead of TestArray,
  34 // so the error messages produced by test failures are more useful.
  35 static std::string SniffMimeType(const std::string& content,
  36                                  const std::string& url,
  37                                  const std::string& mime_type_hint) {
  38   std::string mime_type;
  39   SniffMimeType(content.data(), content.size(), GURL(url),
  40                      mime_type_hint, &mime_type);
  41   return mime_type;
  42 }
  43
  44 TEST(MimeSnifferTest, BoundaryConditionsTest) {
  45   std::string mime_type;
  46   std::string type_hint;
  47
  48   char buf[] = {
  49     'd', '\x1f', '\xFF'
  50   };
  51
  52   GURL url;
  53
  54   SniffMimeType(buf, 0, url, type_hint, &mime_type);
  55   EXPECT_EQ("text/plain", mime_type);
  56   SniffMimeType(buf, 1, url, type_hint, &mime_type);
  57   EXPECT_EQ("text/plain", mime_type);
  58   SniffMimeType(buf, 2, url, type_hint, &mime_type);
  59   EXPECT_EQ("application/octet-stream", mime_type);
  60 }
  61
  62 TEST(MimeSnifferTest, BasicSniffingTest) {
  63   SnifferTest tests[] = {
  64     { "<!DOCTYPE html PUBLIC", sizeof("<!DOCTYPE html PUBLIC")-1,
  65       "http://www.example.com/",
  66       "", "text/html" },
  67     { "<HtMl><Body></body></htMl>", sizeof("<HtMl><Body></body></htMl>")-1,
  68       "http://www.example.com/foo.gif",
  69       "application/octet-stream", "application/octet-stream" },
  70     { "GIF89a\x1F\x83\x94", sizeof("GIF89a\xAF\x83\x94")-1,
  71       "http://www.example.com/foo",
  72       "text/plain", "image/gif" },
  73     { "Gif87a\x1F\x83\x94", sizeof("Gif87a\xAF\x83\x94")-1,
  74       "http://www.example.com/foo?param=tt.gif",
  75       "", "application/octet-stream" },
  76     { "%!PS-Adobe-3.0", sizeof("%!PS-Adobe-3.0")-1,
  77       "http://www.example.com/foo",
  78       "text/plain", "text/plain" },
  79     { "\x89" "PNG\x0D\x0A\x1A\x0A", sizeof("\x89" "PNG\x0D\x0A\x1A\x0A")-1,
  80       "http://www.example.com/foo",
  81       "application/octet-stream", "application/octet-stream" },
  82     { "\xFF\xD8\xFF\x23\x49\xAF", sizeof("\xFF\xD8\xFF\x23\x49\xAF")-1,
  83       "http://www.example.com/foo",
  84       "", "image/jpeg" },
  85   };
  86
  87   TestArray(tests, arraysize(tests));
  88 }
  89
  90 TEST(MimeSnifferTest, ChromeExtensionsTest) {
  91   SnifferTest tests[] = {
  92     // schemes
  93     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
  94       "http://www.example.com/foo.crx",
  95       "", "application/x-chrome-extension" },
  96     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
  97       "https://www.example.com/foo.crx",
  98       "", "application/x-chrome-extension" },
  99     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 100       "ftp://www.example.com/foo.crx",
 101       "", "application/x-chrome-extension" },
 102
 103     // some other mimetypes that should get converted
 104     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 105       "http://www.example.com/foo.crx",
 106       "text/plain", "application/x-chrome-extension" },
 107     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 108       "http://www.example.com/foo.crx",
 109       "application/octet-stream", "application/x-chrome-extension" },
 110
 111     // success edge cases
 112     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 113       "http://www.example.com/foo.crx?query=string",
 114       "", "application/x-chrome-extension" },
 115     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 116       "http://www.example.com/foo..crx",
 117       "", "application/x-chrome-extension" },
 118
 119     // wrong file extension
 120     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 121       "http://www.example.com/foo.bin",
 122       "", "application/octet-stream" },
 123     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 124       "http://www.example.com/foo.bin?monkey",
 125       "", "application/octet-stream" },
 126     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 127       "invalid-url",
 128       "", "application/octet-stream" },
 129     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 130       "http://www.example.com",
 131       "", "application/octet-stream" },
 132     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 133       "http://www.example.com/",
 134       "", "application/octet-stream" },
 135     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 136       "http://www.example.com/foo",
 137       "", "application/octet-stream" },
 138     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 139       "http://www.example.com/foocrx",
 140       "", "application/octet-stream" },
 141     { "Cr24\x02\x00\x00\x00", sizeof("Cr24\x02\x00\x00\x00")-1,
 142       "http://www.example.com/foo.crx.blech",
 143       "", "application/octet-stream" },
 144
 145     // wrong magic
 146     { "Cr24\x02\x00\x00\x01", sizeof("Cr24\x02\x00\x00\x01")-1,
 147       "http://www.example.com/foo.crx?monkey",
 148       "", "application/octet-stream" },
 149     { "PADDING_Cr24\x02\x00\x00\x00", sizeof("PADDING_Cr24\x02\x00\x00\x00")-1,
 150       "http://www.example.com/foo.crx?monkey",
 151       "", "application/octet-stream" },
 152   };
 153
 154   TestArray(tests, arraysize(tests));
 155 }
 156
 157 TEST(MimeSnifferTest, MozillaCompatibleTest) {
 158   SnifferTest tests[] = {
 159     { " \n <hTmL>\n <hea", sizeof(" \n <hTmL>\n <hea")-1,
 160       "http://www.example.com/",
 161       "", "text/html" },
 162     { " \n <hTmL>\n <hea", sizeof(" \n <hTmL>\n <hea")-1,
 163       "http://www.example.com/",
 164       "text/plain", "text/plain" },
 165     { "BMjlakdsfk", sizeof("BMjlakdsfk")-1,
 166       "http://www.example.com/foo",
 167       "", "image/bmp" },
 168     { "\x00\x00\x30\x00", sizeof("\x00\x00\x30\x00")-1,
 169       "http://www.example.com/favicon.ico",
 170       "", "application/octet-stream" },
 171     { "#!/bin/sh\nls /\n", sizeof("#!/bin/sh\nls /\n")-1,
 172       "http://www.example.com/foo",
 173       "", "text/plain" },
 174     { "From: Fred\nTo: Bob\n\nHi\n.\n",
 175       sizeof("From: Fred\nTo: Bob\n\nHi\n.\n")-1,
 176       "http://www.example.com/foo",
 177       "", "text/plain" },
 178     { "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n",
 179       sizeof("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")-1,
 180       "http://www.example.com/foo",
 181       "", "text/xml" },
 182     { "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n",
 183       sizeof("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n")-1,
 184       "http://www.example.com/foo",
 185       "application/octet-stream", "application/octet-stream" },
 186   };
 187
 188   TestArray(tests, arraysize(tests));
 189 }
 190
 191 TEST(MimeSnifferTest, DontAllowPrivilegeEscalationTest) {
 192   SnifferTest tests[] = {
 193     { "GIF87a\n<html>\n<body>"
 194         "<script>alert('haxorzed');\n</script>"
 195         "</body></html>\n",
 196       sizeof("GIF87a\n<html>\n<body>"
 197         "<script>alert('haxorzed');\n</script>"
 198         "</body></html>\n")-1,
 199       "http://www.example.com/foo",
 200       "", "image/gif" },
 201     { "GIF87a\n<html>\n<body>"
 202         "<script>alert('haxorzed');\n</script>"
 203         "</body></html>\n",
 204       sizeof("GIF87a\n<html>\n<body>"
 205         "<script>alert('haxorzed');\n</script>"
 206         "</body></html>\n")-1,
 207       "http://www.example.com/foo?q=ttt.html",
 208       "", "image/gif" },
 209     { "GIF87a\n<html>\n<body>"
 210         "<script>alert('haxorzed');\n</script>"
 211         "</body></html>\n",
 212       sizeof("GIF87a\n<html>\n<body>"
 213         "<script>alert('haxorzed');\n</script>"
 214         "</body></html>\n")-1,
 215       "http://www.example.com/foo#ttt.html",
 216       "", "image/gif" },
 217     { "a\n<html>\n<body>"
 218         "<script>alert('haxorzed');\n</script>"
 219         "</body></html>\n",
 220       sizeof("a\n<html>\n<body>"
 221         "<script>alert('haxorzed');\n</script>"
 222         "</body></html>\n")-1,
 223       "http://www.example.com/foo",
 224       "", "text/plain" },
 225     { "a\n<html>\n<body>"
 226         "<script>alert('haxorzed');\n</script>"
 227         "</body></html>\n",
 228       sizeof("a\n<html>\n<body>"
 229         "<script>alert('haxorzed');\n</script>"
 230         "</body></html>\n")-1,
 231       "http://www.example.com/foo?q=ttt.html",
 232       "", "text/plain" },
 233     { "a\n<html>\n<body>"
 234         "<script>alert('haxorzed');\n</script>"
 235         "</body></html>\n",
 236       sizeof("a\n<html>\n<body>"
 237         "<script>alert('haxorzed');\n</script>"
 238         "</body></html>\n")-1,
 239       "http://www.example.com/foo#ttt.html",
 240       "", "text/plain" },
 241     { "a\n<html>\n<body>"
 242         "<script>alert('haxorzed');\n</script>"
 243         "</body></html>\n",
 244       sizeof("a\n<html>\n<body>"
 245         "<script>alert('haxorzed');\n</script>"
 246         "</body></html>\n")-1,
 247       "http://www.example.com/foo.html",
 248       "", "text/plain" },
 249   };
 250
 251   TestArray(tests, arraysize(tests));
 252 }
 253
 254 TEST(MimeSnifferTest, UnicodeTest) {
 255   SnifferTest tests[] = {
 256     { "\xEF\xBB\xBF" "Hi there", sizeof("\xEF\xBB\xBF" "Hi there")-1,
 257       "http://www.example.com/foo",
 258       "", "text/plain" },
 259     { "\xEF\xBB\xBF\xED\x7A\xAD\x7A\x0D\x79",
 260       sizeof("\xEF\xBB\xBF\xED\x7A\xAD\x7A\x0D\x79")-1,
 261       "http://www.example.com/foo",
 262       "", "text/plain" },
 263     { "\xFE\xFF\xD0\xA5\xD0\xBE\xD0\xBB\xD1\x83\xD0\xB9",
 264       sizeof("\xFE\xFF\xD0\xA5\xD0\xBE\xD0\xBB\xD1\x83\xD0\xB9")-1,
 265       "http://www.example.com/foo",
 266       "", "text/plain" },
 267     { "\xFE\xFF\x00\x41\x00\x20\xD8\x00\xDC\x00\xD8\x00\xDC\x01",
 268       sizeof("\xFE\xFF\x00\x41\x00\x20\xD8\x00\xDC\x00\xD8\x00\xDC\x01")-1,
 269       "http://www.example.com/foo",
 270       "", "text/plain" },
 271   };
 272
 273   TestArray(tests, arraysize(tests));
 274 }
 275
 276 TEST(MimeSnifferTest, FlashTest) {
 277   SnifferTest tests[] = {
 278     { "CWSdd\x00\xB3", sizeof("CWSdd\x00\xB3")-1,
 279       "http://www.example.com/foo",
 280       "", "application/octet-stream" },
 281     { "FLVjdkl*(#)0sdj\x00", sizeof("FLVjdkl*(#)0sdj\x00")-1,
 282       "http://www.example.com/foo?q=ttt.swf",
 283       "", "application/octet-stream" },
 284     { "FWS3$9\r\b\x00", sizeof("FWS3$9\r\b\x00")-1,
 285       "http://www.example.com/foo#ttt.swf",
 286       "", "application/octet-stream" },
 287     { "FLVjdkl*(#)0sdj", sizeof("FLVjdkl*(#)0sdj")-1,
 288       "http://www.example.com/foo.swf",
 289       "", "text/plain" },
 290     { "FLVjdkl*(#)0s\x01dj", sizeof("FLVjdkl*(#)0s\x01dj")-1,
 291       "http://www.example.com/foo/bar.swf",
 292       "", "application/octet-stream" },
 293     { "FWS3$9\r\b\x1A", sizeof("FWS3$9\r\b\x1A")-1,
 294       "http://www.example.com/foo.swf?clickTAG=http://www.adnetwork.com/bar",
 295       "", "application/octet-stream" },
 296     { "FWS3$9\r\x1C\b", sizeof("FWS3$9\r\x1C\b")-1,
 297       "http://www.example.com/foo.swf?clickTAG=http://www.adnetwork.com/bar",
 298       "text/plain", "application/octet-stream" },
 299   };
 300
 301   TestArray(tests, arraysize(tests));
 302 }
 303
 304 TEST(MimeSnifferTest, XMLTest) {
 305   // An easy feed to identify.
 306   EXPECT_EQ("application/atom+xml",
 307             SniffMimeType("<?xml?><feed", std::string(), "text/xml"));
 308   // Don't sniff out of plain text.
 309   EXPECT_EQ("text/plain",
 310             SniffMimeType("<?xml?><feed", std::string(), "text/plain"));
 311   // Simple RSS.
 312   EXPECT_EQ("application/rss+xml",
 313             SniffMimeType(
 314                 "<?xml version='1.0'?>\r\n<rss", std::string(), "text/xml"));
 315
 316   // The top of CNN's RSS feed, which we'd like to recognize as RSS.
 317   static const char kCNNRSS[] =
 318       "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
 319       "<?xml-stylesheet href=\"http://rss.cnn.com/~d/styles/rss2full.xsl\" "
 320       "type=\"text/xsl\" media=\"screen\"?>"
 321       "<?xml-stylesheet href=\"http://rss.cnn.com/~d/styles/itemcontent.css\" "
 322       "type=\"text/css\" media=\"screen\"?>"
 323       "<rss xmlns:feedburner=\"http://rssnamespace.org/feedburner/ext/1.0\" "
 324       "version=\"2.0\">";
 325   // CNN's RSS
 326   EXPECT_EQ("application/rss+xml",
 327             SniffMimeType(kCNNRSS, std::string(), "text/xml"));
 328   EXPECT_EQ("text/plain", SniffMimeType(kCNNRSS, std::string(), "text/plain"));
 329
 330   // Don't sniff random XML as something different.
 331   EXPECT_EQ("text/xml",
 332             SniffMimeType("<?xml?><notafeed", std::string(), "text/xml"));
 333   // Don't sniff random plain-text as something different.
 334   EXPECT_EQ("text/plain",
 335             SniffMimeType("<?xml?><notafeed", std::string(), "text/plain"));
 336
 337   // Positive test for the two instances we upgrade to XHTML.
 338   EXPECT_EQ("application/xhtml+xml",
 339             SniffMimeType("<html xmlns=\"http://www.w3.org/1999/xhtml\">",
 340                           std::string(),
 341                           "text/xml"));
 342   EXPECT_EQ("application/xhtml+xml",
 343             SniffMimeType("<html xmlns=\"http://www.w3.org/1999/xhtml\">",
 344                           std::string(),
 345                           "application/xml"));
 346
 347   // Following our behavior with HTML, don't call other mime types XHTML.
 348   EXPECT_EQ("text/plain",
 349             SniffMimeType("<html xmlns=\"http://www.w3.org/1999/xhtml\">",
 350                           std::string(),
 351                           "text/plain"));
 352   EXPECT_EQ("application/rss+xml",
 353             SniffMimeType("<html xmlns=\"http://www.w3.org/1999/xhtml\">",
 354                           std::string(),
 355                           "application/rss+xml"));
 356
 357   // Don't sniff other HTML-looking bits as HTML.
 358   EXPECT_EQ("text/xml",
 359             SniffMimeType("<html><head>", std::string(), "text/xml"));
 360   EXPECT_EQ("text/xml",
 361             SniffMimeType("<foo><html xmlns=\"http://www.w3.org/1999/xhtml\">",
 362                           std::string(),
 363                           "text/xml"));
 364 }
 365
 366 // Test content which is >= 1024 bytes, and includes no open angle bracket.
 367 // http://code.google.com/p/chromium/issues/detail?id=3521
 368 TEST(MimeSnifferTest, XMLTestLargeNoAngledBracket) {
 369   // Make a large input, with 1024 bytes of "x".
 370   std::string content;
 371   content.resize(1024);
 372   std::fill(content.begin(), content.end(), 'x');
 373
 374   // content.size() >= 1024 so the sniff is unambiguous.
 375   std::string mime_type;
 376   EXPECT_TRUE(SniffMimeType(content.data(), content.size(), GURL(),
 377                             "text/xml", &mime_type));
 378   EXPECT_EQ("text/xml", mime_type);
 379 }
 380
 381 // Test content which is >= 1024 bytes, and includes a binary looking byte.
 382 // http://code.google.com/p/chromium/issues/detail?id=15314
 383 TEST(MimeSnifferTest, LooksBinary) {
 384   // Make a large input, with 1024 bytes of "x" and 1 byte of 0x01.
 385   std::string content;
 386   content.resize(1024);
 387   std::fill(content.begin(), content.end(), 'x');
 388   content[1000] = 0x01;
 389
 390   // content.size() >= 1024 so the sniff is unambiguous.
 391   std::string mime_type;
 392   EXPECT_TRUE(SniffMimeType(content.data(), content.size(), GURL(),
 393                             "text/plain", &mime_type));
 394   EXPECT_EQ("application/octet-stream", mime_type);
 395 }
 396
 397 TEST(MimeSnifferTest, OfficeTest) {
 398   SnifferTest tests[] = {
 399     // Check for URLs incorrectly reported as Microsoft Office files.
 400     { "Hi there",
 401       sizeof("Hi there")-1,
 402       "http://www.example.com/foo.doc",
 403       "application/msword", "application/octet-stream" },
 404     { "Hi there",
 405       sizeof("Hi there")-1,
 406       "http://www.example.com/foo.xls",
 407       "application/vnd.ms-excel", "application/octet-stream" },
 408     { "Hi there",
 409       sizeof("Hi there")-1,
 410       "http://www.example.com/foo.ppt",
 411       "application/vnd.ms-powerpoint", "application/octet-stream" },
 412     // Check for Microsoft Office files incorrectly reported as text.
 413     { "\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" "Hi there",
 414       sizeof("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" "Hi there")-1,
 415       "http://www.example.com/foo.doc",
 416       "text/plain", "application/msword" },
 417     { "PK\x03\x04" "Hi there",
 418       sizeof("PK\x03\x04" "Hi there")-1,
 419       "http://www.example.com/foo.doc",
 420       "text/plain",
 421       "application/vnd.openxmlformats-officedocument."
 422       "wordprocessingml.document" },
 423     { "\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" "Hi there",
 424       sizeof("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" "Hi there")-1,
 425       "http://www.example.com/foo.xls",
 426       "text/plain", "application/vnd.ms-excel" },
 427     { "PK\x03\x04" "Hi there",
 428       sizeof("PK\x03\x04" "Hi there")-1,
 429       "http://www.example.com/foo.xls",
 430       "text/plain",
 431       "application/vnd.openxmlformats-officedocument."
 432       "spreadsheetml.sheet" },
 433     { "\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" "Hi there",
 434       sizeof("\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1" "Hi there")-1,
 435       "http://www.example.com/foo.ppt",
 436       "text/plain", "application/vnd.ms-powerpoint" },
 437     { "PK\x03\x04" "Hi there",
 438       sizeof("PK\x03\x04" "Hi there")-1,
 439       "http://www.example.com/foo.ppt",
 440       "text/plain",
 441       "application/vnd.openxmlformats-officedocument."
 442       "presentationml.presentation" },
 443   };
 444
 445   TestArray(tests, arraysize(tests));
 446 }
 447
 448 // TODO(thestig) Add more tests for other AV formats. Add another test case for
 449 // RAW images.
 450 TEST(MimeSnifferTest, AudioVideoTest) {
 451   std::string mime_type;
 452   const char kFlacTestData[] =
 453       "fLaC\x00\x00\x00\x22\x12\x00\x12\x00\x00\x00\x00\x00";
 454   EXPECT_TRUE(SniffMimeTypeFromLocalData(kFlacTestData,
 455                                          sizeof(kFlacTestData),
 456                                          &mime_type));
 457   EXPECT_EQ("audio/x-flac", mime_type);
 458   mime_type.clear();
 459
 460   const char kWMATestData[] =
 461       "\x30\x26\xb2\x75\x8e\x66\xcf\x11\xa6\xd9\x00\xaa\x00\x62\xce\x6c";
 462   EXPECT_TRUE(SniffMimeTypeFromLocalData(kWMATestData,
 463                                          sizeof(kWMATestData),
 464                                          &mime_type));
 465   EXPECT_EQ("video/x-ms-asf", mime_type);
 466   mime_type.clear();
 467
 468   // mp4a, m4b, m4p, and alac extension files which share the same container
 469   // format.
 470   const char kMP4TestData[] =
 471       "\x00\x00\x00\x20\x66\x74\x79\x70\x4d\x34\x41\x20\x00\x00\x00\x00";
 472   EXPECT_TRUE(SniffMimeTypeFromLocalData(kMP4TestData,
 473                                          sizeof(kMP4TestData),
 474                                          &mime_type));
 475   EXPECT_EQ("video/mp4", mime_type);
 476   mime_type.clear();
 477
 478   const char kAACTestData[] =
 479       "\xff\xf1\x50\x80\x02\x20\xb0\x23\x0a\x83\x20\x7d\x61\x90\x3e\xb1";
 480   EXPECT_TRUE(SniffMimeTypeFromLocalData(kAACTestData,
 481                                          sizeof(kAACTestData),
 482                                          &mime_type));
 483   EXPECT_EQ("audio/mpeg", mime_type);
 484   mime_type.clear();
 485 }
 486
 487 }  // namespace net