René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"\"Principal name not found\" error on downloading a file","articleBody":"I am trying to download a file from Nextcloud (self-hosted, version is 20.0.8.1). The top level view in Nextcloud has a file \"Nextcloud.mp4\". I have verified that the username and password is correct (got a 401 error when I used the wrong password). I have also tried other methods without success (see the commented lines).\r\n\r\nHere is my code:\r\n```\r\n        try {\r\n            NextcloudConnector nc = new NextcloudConnector(\"nextcloud.example.com\", true, 443, \"my.name@example.com\", \"mypassword\");\r\n            InputStream file = nc.downloadFile(\"/Nextcloud.mp4\");\r\n            //nc.createFolder(\"/Test\");\r\n            //List fileNames = nc.listFolderContent(\"/\");\r\n        } catch (Exception e) {\r\n            System.out.println(e);\r\n        }\r\n```\r\nAnd here is the log file output:\r\n```\r\n09:50:31.858 [main] DEBUG org.apache.http.headers - http-outgoing-1 \u003e\u003e GET /remote.php/dav/files/my.name@example.com/Nextcloud.mp4/ HTTP/1.1\r\n09:50:31.858 [main] DEBUG org.apache.http.headers - http-outgoing-1 \u003e\u003e Host: nextcloud.example.com:443\r\n09:50:31.858 [main] DEBUG org.apache.http.headers - http-outgoing-1 \u003e\u003e Connection: Keep-Alive\r\n09:50:31.858 [main] DEBUG org.apache.http.headers - http-outgoing-1 \u003e\u003e User-Agent: Sardine/5.10\r\n09:50:31.858 [main] DEBUG org.apache.http.headers - http-outgoing-1 \u003e\u003e Accept-Encoding: gzip,deflate\r\n09:50:31.858 [main] DEBUG org.apache.http.headers - http-outgoing-1 \u003e\u003e Authorization: Basic QXJu.....\r\n09:50:31.858 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"GET /remote.php/dav/files/my.name@example.com/Nextcloud.mp4/ HTTP/1.1[\\r][\\n]\"\r\n09:50:31.858 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"Host: nextcloud.example.com:443[\\r][\\n]\"\r\n09:50:31.859 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"Connection: Keep-Alive[\\r][\\n]\"\r\n09:50:31.859 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"User-Agent: Sardine/5.10[\\r][\\n]\"\r\n09:50:31.859 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"Accept-Encoding: gzip,deflate[\\r][\\n]\"\r\n09:50:31.859 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"Authorization: Basic QXJu...[\\r][\\n]\"\r\n09:50:31.859 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003e\u003e \"[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"HTTP/1.1 404 Not Found[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Date: Wed, 06 Oct 2021 07:50:31 GMT[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Server: Apache/2.4.25 (Debian)[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Strict-Transport-Security: max-age=15768000 ; includeSubDomains[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Expires: Thu, 19 Nov 1981 08:52:00 GMT[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Cache-Control: no-store, no-cache, must-revalidate[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Pragma: no-cache[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Content-Security-Policy: default-src 'none';[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Referrer-Policy: no-referrer[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"X-Content-Type-Options: nosniff[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"X-Download-Options: noopen[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"X-Frame-Options: SAMEORIGIN[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"X-Permitted-Cross-Domain-Policies: none[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"X-Robots-Tag: none[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"X-XSS-Protection: 1; mode=block[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Content-Length: 253[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Content-Type: application/xml; charset=utf-8[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: oc4ld86aguy6=0ca6a655f8a1e9e694af6eaf6b4b2616; path=/; secure; HttpOnly; SameSite=Lax[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: oc_sessionPassphrase=An5OH5L.....; path=/; secure; HttpOnly; SameSite=Lax[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: oc4ld8....; path=/; secure; HttpOnly; SameSite=Lax[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: __Host-nc_sameSiteCookielax=true; path=/; httponly;secure; expires=Fri, 31-Dec-2100 23:59:59 GMT; SameSite=lax[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: __Host-nc_sameSiteCookiestrict=true; path=/; httponly;secure; expires=Fri, 31-Dec-2100 23:59:59 GMT; SameSite=strict[\\r][\\n]\"\r\n09:50:33.499 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: oc4ld86a....; path=/; secure; HttpOnly; SameSite=Lax[\\r][\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Set-Cookie: cookie_test=test; expires=Wed, 06-Oct-2021 08:50:33 GMT; Max-Age=3600[\\r][\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Keep-Alive: timeout=5, max=100[\\r][\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"Connection: Keep-Alive[\\r][\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"[\\r][\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"\u003c?xml version=\"1.0\" encoding=\"utf-8\"?\u003e[\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"\u003cd:error xmlns:d=\"DAV:\" xmlns:s=\"http://sabredav.org/ns\"\u003e[\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"  \u003cs:exception\u003eSabre\\DAV\\Exception\\NotFound\u003c/s:exception\u003e[\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"  \u003cs:message\u003ePrincipal with name my.name@example.com not found\u003c/s:message\u003e[\\n]\"\r\n09:50:33.500 [main] DEBUG org.apache.http.wire - http-outgoing-1 \u003c\u003c \"\u003c/d:error\u003e[\\n]\"\r\n...\r\norg.aarboard.nextcloud.api.exception.NextcloudApiException: com.github.sardine.impl.SardineException: Unexpected response (404 Not Found)\r\n```\r\nThe url \"https://nextcloud.example.com/remote.php/dav/files/my.name@example.com/Nextcloud.mp4/\" results in fact in a 404 error when pasted into the browser. However, when I replace the user name part with the uuid that is listed in the Nextcloud administrator user listing near my full name (\"https://nextcloud.example.com/remote.php/dav/files/BA00370B-3FFZ-4295-8D76-C232DA9B3565/Nextcloud.mp4/\"), I can successfully download the file via the browser.\r\n\r\nSo this shows that the path to the file in the nc.downloadFile call seems to be correct. I also tried replacing my user name by the uuid in the code, but then the login fails.\r\n\r\nPlease advise what to do to successfully download the file by a Java program.","author":{"url":"https://github.com/schirmacher","@type":"Person","name":"schirmacher"},"datePublished":"2021-10-06T09:06:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/68/nextcloud-java-api/issues/68"}