it randomly fails to scrape AtCoder

[kmyk]

たぶん鯖側のキャッシュの関係でしょう。betaから取る用に変更すれば直るはず

$ ./oj -v g/s https://beta.atcoder.jp/contests/arc083/tasks/arc083_a
[DEBUG] args: Namespace(cookie=PosixPath('/home/user/.local/share/online-judge-tools/cookie.jar'), repeat_macro=None, scanf=False, silent=False, subcommand='g/s', url='https://beta.atcoder.jp/contests/arc083/tasks/arc083_a', verbose=True)
[!] This feature is experimental.
[x] problem recognized: <onlinejudge.service.atcoder.AtCoderProblem object at 0x7fd846926438>: https://beta.atcoder.jp/contests/arc083/tasks/arc083_a
[x] load cookie from: /home/user/.local/share/online-judge-tools/cookie.jar
[x] GET: http://arc083.contest.atcoder.jp/tasks/arc083_a
[x] 200 OK
[DEBUG] cookie: <Cookie __passport=VkITwvpHHRhp-U2GRqjgNA for .arc083.contest.atcoder.jp/>
[DEBUG] cookie: <Cookie __privilege=guest for .arc083.contest.atcoder.jp/>
[DEBUG] cookie: <Cookie _kick_id=2012-04-25+04%3A51 for .atcoder.jp/>
[x] save cookie to: /home/user/.local/share/online-judge-tools/cookie.jar
[DEBUG] original data: 'A B C D E F\r\n'
[DEBUG] tokenized: [[{'kind': 'fixed', 'name': 'A'}, {'kind': 'fixed', 'name': 'B'}, {'kind': 'fixed', 'name': 'C'}, {'kind': 'fixed', 'name': 'D'}, {'kind': 'fixed', 'name': 'E'}, {'kind': 'fixed', 'name': 'F'}]]
[DEBUG] parsed: [{'kind': 'decl', 'names': ['A']}, {'kind': 'read', 'names': ['A']}, {'kind': 'decl', 'names': ['B']}, {'kind': 'read', 'names': ['B']}, {'kind': 'decl', 'names': ['C']}, {'kind': 'read', 'names': ['C']}, {'kind': 'decl', 'names': ['D']}, {'kind': 'read', 'names': ['D']}, {'kind': 'decl', 'names': ['E']}, {'kind': 'read', 'names': ['E']}, {'kind': 'decl', 'names': ['F']}, {'kind': 'read', 'names': ['F']}]
[DEBUG] postprocessed: [{'kind': 'decl', 'names': ['A', 'B', 'C', 'D', 'E', 'F']}, {'kind': 'read', 'names': ['A', 'B', 'C', 'D', 'E', 'F']}]
[DEBUG] result: 'int A, B, C, D, E, F; cin >> A >> B >> C >> D >> E >> F;\n'
[+] success:
int A, B, C, D, E, F; cin >> A >> B >> C >> D >> E >> F;
$ ./oj -v g/s https://beta.atcoder.jp/contests/arc083/tasks/arc083_a
[DEBUG] args: Namespace(cookie=PosixPath('/home/user/.local/share/online-judge-tools/cookie.jar'), repeat_macro=None, scanf=False, silent=False, subcommand='g/s', url='https://beta.atcoder.jp/contests/arc083/tasks/arc083_a', verbose=True)
[!] This feature is experimental.
[x] problem recognized: <onlinejudge.service.atcoder.AtCoderProblem object at 0x7f56444095c0>: https://beta.atcoder.jp/contests/arc083/tasks/arc083_a
[x] load cookie from: /home/user/.local/share/online-judge-tools/cookie.jar
[x] GET: http://arc083.contest.atcoder.jp/tasks/arc083_a
[x] 200 OK
[DEBUG] cookie: <Cookie _kick_id=2012-04-25+04%3A51 for .atcoder.jp/>
[x] save cookie to: /home/user/.local/share/online-judge-tools/cookie.jar
[ERROR] input format not found

[kmyk]

英語力

[kmyk]

Content-Type: text/html; charset=utf-8 と Content-Type: text/html が混在してるね

[kmyk]

直した