We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
may be 'accessible'?
in the function [request_fingerprint](https://github.com/scrapy/scrapy/blob/master/scrapy/utils/request.py) ，‘accesible’ may be ‘accessible’ in comments. OCD  XD..


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `scrapy/utils/request.py`
Content:
```
1 """
2 This module provides some useful functions for working with
3 scrapy.http.Request objects
4 """
5 
6 from __future__ import print_function
7 import hashlib
8 import weakref
9 from six.moves.urllib.parse import urlunparse
10 
11 from w3lib.http import basic_auth_header
12 from scrapy.utils.python import to_bytes, to_native_str
13 
14 from w3lib.url import canonicalize_url
15 from scrapy.utils.httpobj import urlparse_cached
16 
17 
18 _fingerprint_cache = weakref.WeakKeyDictionary()
19 def request_fingerprint(request, include_headers=None):
20     """
21     Return the request fingerprint.
22 
23     The request fingerprint is a hash that uniquely identifies the resource the
24     request points to. For example, take the following two urls:
25 
26     http://www.example.com/query?id=111&cat=222
27     http://www.example.com/query?cat=222&id=111
28 
29     Even though those are two different URLs both point to the same resource
30     and are equivalent (ie. they should return the same response).
31 
32     Another example are cookies used to store session ids. Suppose the
33     following page is only accesible to authenticated users:
34 
35     http://www.example.com/members/offers.html
36 
37     Lot of sites use a cookie to store the session id, which adds a random
38     component to the HTTP Request and thus should be ignored when calculating
39     the fingerprint.
40 
41     For this reason, request headers are ignored by default when calculating
42     the fingeprint. If you want to include specific headers use the
43     include_headers argument, which is a list of Request headers to include.
44 
45     """
46     if include_headers:
47         include_headers = tuple(to_bytes(h.lower())
48                                  for h in sorted(include_headers))
49     cache = _fingerprint_cache.setdefault(request, {})
50     if include_headers not in cache:
51         fp = hashlib.sha1()
52         fp.update(to_bytes(request.method))
53         fp.update(to_bytes(canonicalize_url(request.url)))
54         fp.update(request.body or b'')
55         if include_headers:
56             for hdr in include_headers:
57                 if hdr in request.headers:
58                     fp.update(hdr)
59                     for v in request.headers.getlist(hdr):
60                         fp.update(v)
61         cache[include_headers] = fp.hexdigest()
62     return cache[include_headers]
63 
64 
65 def request_authenticate(request, username, password):
66     """Autenticate the given request (in place) using the HTTP basic access
67     authentication mechanism (RFC 2617) and the given username and password
68     """
69     request.headers['Authorization'] = basic_auth_header(username, password)
70 
71 
72 def request_httprepr(request):
73     """Return the raw HTTP representation (as bytes) of the given request.
74     This is provided only for reference since it's not the actual stream of
75     bytes that will be send when performing the request (that's controlled
76     by Twisted).
77     """
78     parsed = urlparse_cached(request)
79     path = urlunparse(('', '', parsed.path or '/', parsed.params, parsed.query, ''))
80     s = to_bytes(request.method) + b" " + to_bytes(path) + b" HTTP/1.1\r\n"
81     s += b"Host: " + to_bytes(parsed.hostname or b'') + b"\r\n"
82     if request.headers:
83         s += request.headers.to_string() + b"\r\n"
84     s += b"\r\n"
85     s += request.body
86     return s
87 
88 
89 def referer_str(request):
90     """ Return Referer HTTP header suitable for logging. """
91     referrer = request.headers.get('Referer')
92     if referrer is None:
93         return referrer
94     return to_native_str(referrer, errors='replace')
95
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/scrapy/utils/request.py b/scrapy/utils/request.py
--- a/scrapy/utils/request.py
+++ b/scrapy/utils/request.py
@@ -30,7 +30,7 @@
     and are equivalent (ie. they should return the same response).
 
     Another example are cookies used to store session ids. Suppose the
-    following page is only accesible to authenticated users:
+    following page is only accessible to authenticated users:
 
     http://www.example.com/members/offers.html

{"golden_diff": "diff --git a/scrapy/utils/request.py b/scrapy/utils/request.py\n--- a/scrapy/utils/request.py\n+++ b/scrapy/utils/request.py\n@@ -30,7 +30,7 @@\n     and are equivalent (ie. they should return the same response).\n \n     Another example are cookies used to store session ids. Suppose the\n-    following page is only accesible to authenticated users:\n+    following page is only accessible to authenticated users:\n \n     http://www.example.com/members/offers.html\n", "issue": "may be 'accessible'?\nin the function [request_fingerprint](https://github.com/scrapy/scrapy/blob/master/scrapy/utils/request.py) \uff0c\u2018accesible\u2019 may be \u2018accessible\u2019 in comments. OCD  XD..\r\n\n", "before_files": [{"content": "\"\"\"\nThis module provides some useful functions for working with\nscrapy.http.Request objects\n\"\"\"\n\nfrom __future__ import print_function\nimport hashlib\nimport weakref\nfrom six.moves.urllib.parse import urlunparse\n\nfrom w3lib.http import basic_auth_header\nfrom scrapy.utils.python import to_bytes, to_native_str\n\nfrom w3lib.url import canonicalize_url\nfrom scrapy.utils.httpobj import urlparse_cached\n\n\n_fingerprint_cache = weakref.WeakKeyDictionary()\ndef request_fingerprint(request, include_headers=None):\n    \"\"\"\n    Return the request fingerprint.\n\n    The request fingerprint is a hash that uniquely identifies the resource the\n    request points to. For example, take the following two urls:\n\n    http://www.example.com/query?id=111&cat=222\n    http://www.example.com/query?cat=222&id=111\n\n    Even though those are two different URLs both point to the same resource\n    and are equivalent (ie. they should return the same response).\n\n    Another example are cookies used to store session ids. Suppose the\n    following page is only accesible to authenticated users:\n\n    http://www.example.com/members/offers.html\n\n    Lot of sites use a cookie to store the session id, which adds a random\n    component to the HTTP Request and thus should be ignored when calculating\n    the fingerprint.\n\n    For this reason, request headers are ignored by default when calculating\n    the fingeprint. If you want to include specific headers use the\n    include_headers argument, which is a list of Request headers to include.\n\n    \"\"\"\n    if include_headers:\n        include_headers = tuple(to_bytes(h.lower())\n                                 for h in sorted(include_headers))\n    cache = _fingerprint_cache.setdefault(request, {})\n    if include_headers not in cache:\n        fp = hashlib.sha1()\n        fp.update(to_bytes(request.method))\n        fp.update(to_bytes(canonicalize_url(request.url)))\n        fp.update(request.body or b'')\n        if include_headers:\n            for hdr in include_headers:\n                if hdr in request.headers:\n                    fp.update(hdr)\n                    for v in request.headers.getlist(hdr):\n                        fp.update(v)\n        cache[include_headers] = fp.hexdigest()\n    return cache[include_headers]\n\n\ndef request_authenticate(request, username, password):\n    \"\"\"Autenticate the given request (in place) using the HTTP basic access\n    authentication mechanism (RFC 2617) and the given username and password\n    \"\"\"\n    request.headers['Authorization'] = basic_auth_header(username, password)\n\n\ndef request_httprepr(request):\n    \"\"\"Return the raw HTTP representation (as bytes) of the given request.\n    This is provided only for reference since it's not the actual stream of\n    bytes that will be send when performing the request (that's controlled\n    by Twisted).\n    \"\"\"\n    parsed = urlparse_cached(request)\n    path = urlunparse(('', '', parsed.path or '/', parsed.params, parsed.query, ''))\n    s = to_bytes(request.method) + b\" \" + to_bytes(path) + b\" HTTP/1.1\\r\\n\"\n    s += b\"Host: \" + to_bytes(parsed.hostname or b'') + b\"\\r\\n\"\n    if request.headers:\n        s += request.headers.to_string() + b\"\\r\\n\"\n    s += b\"\\r\\n\"\n    s += request.body\n    return s\n\n\ndef referer_str(request):\n    \"\"\" Return Referer HTTP header suitable for logging. \"\"\"\n    referrer = request.headers.get('Referer')\n    if referrer is None:\n        return referrer\n    return to_native_str(referrer, errors='replace')\n", "path": "scrapy/utils/request.py"}], "after_files": [{"content": "\"\"\"\nThis module provides some useful functions for working with\nscrapy.http.Request objects\n\"\"\"\n\nfrom __future__ import print_function\nimport hashlib\nimport weakref\nfrom six.moves.urllib.parse import urlunparse\n\nfrom w3lib.http import basic_auth_header\nfrom scrapy.utils.python import to_bytes, to_native_str\n\nfrom w3lib.url import canonicalize_url\nfrom scrapy.utils.httpobj import urlparse_cached\n\n\n_fingerprint_cache = weakref.WeakKeyDictionary()\ndef request_fingerprint(request, include_headers=None):\n    \"\"\"\n    Return the request fingerprint.\n\n    The request fingerprint is a hash that uniquely identifies the resource the\n    request points to. For example, take the following two urls:\n\n    http://www.example.com/query?id=111&cat=222\n    http://www.example.com/query?cat=222&id=111\n\n    Even though those are two different URLs both point to the same resource\n    and are equivalent (ie. they should return the same response).\n\n    Another example are cookies used to store session ids. Suppose the\n    following page is only accessible to authenticated users:\n\n    http://www.example.com/members/offers.html\n\n    Lot of sites use a cookie to store the session id, which adds a random\n    component to the HTTP Request and thus should be ignored when calculating\n    the fingerprint.\n\n    For this reason, request headers are ignored by default when calculating\n    the fingeprint. If you want to include specific headers use the\n    include_headers argument, which is a list of Request headers to include.\n\n    \"\"\"\n    if include_headers:\n        include_headers = tuple(to_bytes(h.lower())\n                                 for h in sorted(include_headers))\n    cache = _fingerprint_cache.setdefault(request, {})\n    if include_headers not in cache:\n        fp = hashlib.sha1()\n        fp.update(to_bytes(request.method))\n        fp.update(to_bytes(canonicalize_url(request.url)))\n        fp.update(request.body or b'')\n        if include_headers:\n            for hdr in include_headers:\n                if hdr in request.headers:\n                    fp.update(hdr)\n                    for v in request.headers.getlist(hdr):\n                        fp.update(v)\n        cache[include_headers] = fp.hexdigest()\n    return cache[include_headers]\n\n\ndef request_authenticate(request, username, password):\n    \"\"\"Autenticate the given request (in place) using the HTTP basic access\n    authentication mechanism (RFC 2617) and the given username and password\n    \"\"\"\n    request.headers['Authorization'] = basic_auth_header(username, password)\n\n\ndef request_httprepr(request):\n    \"\"\"Return the raw HTTP representation (as bytes) of the given request.\n    This is provided only for reference since it's not the actual stream of\n    bytes that will be send when performing the request (that's controlled\n    by Twisted).\n    \"\"\"\n    parsed = urlparse_cached(request)\n    path = urlunparse(('', '', parsed.path or '/', parsed.params, parsed.query, ''))\n    s = to_bytes(request.method) + b\" \" + to_bytes(path) + b\" HTTP/1.1\\r\\n\"\n    s += b\"Host: \" + to_bytes(parsed.hostname or b'') + b\"\\r\\n\"\n    if request.headers:\n        s += request.headers.to_string() + b\"\\r\\n\"\n    s += b\"\\r\\n\"\n    s += request.body\n    return s\n\n\ndef referer_str(request):\n    \"\"\" Return Referer HTTP header suitable for logging. \"\"\"\n    referrer = request.headers.get('Referer')\n    if referrer is None:\n        return referrer\n    return to_native_str(referrer, errors='replace')\n", "path": "scrapy/utils/request.py"}]}