CarGuo/GSYVideoPlayer · error · ProxyCacheException

Error reading data from ${sourceInfo.url}

Error message

Error reading data from ${sourceInfo.url}

What it means

HttpUrlSource.openConnection implements manual redirect following: on 301/302/303 it takes the Location header and re-opens, counting hops. If redirectCount exceeds MAX_REDIRECTS (5), it throws ProxyCacheException('Too many redirects: N'). This guards against redirect loops (A->B->A) and auth walls that keep bouncing the proxy.

Source

Thrown at gsyVideoPlayer-proxy_cache/src/main/java/com/danikula/videocache/HttpUrlSource.java:140

            } catch (ArrayIndexOutOfBoundsException e) {
                HttpProxyCacheDebuger.printfError("Error closing connection correctly. Should happen only on Android L. " +
                    "If anybody know how to fix it, please visit https://github.com/danikula/AndroidVideoCache/issues/88. " +
                    "Until good solution is not know, just ignore this issue :(", e);
            }
        }
    }

    @Override
    public int read(byte[] buffer) throws ProxyCacheException {
        if (inputStream == null) {
            throw new ProxyCacheException("Error reading data from " + sourceInfo.url + ": connection is absent!");
        }
        try {
            return inputStream.read(buffer, 0, buffer.length);
        } catch (InterruptedIOException e) {
            throw new InterruptedProxyCacheException("Reading source " + sourceInfo.url + " is interrupted", e);
        } catch (IOException e) {
            throw new ProxyCacheException("Error reading data from " + sourceInfo.url, e);
        }
    }

    private void fetchContentInfo() throws ProxyCacheException {
        HttpURLConnection urlConnection = null;
        InputStream inputStream = null;
        try {
            urlConnection = openConnection(0, 10000);
            long length = getContentLength(urlConnection);
            String mime = urlConnection.getContentType();
            inputStream = urlConnection.getInputStream();
            this.sourceInfo = new SourceInfo(sourceInfo.url, length, mime);
            this.sourceInfoStorage.put(sourceInfo.url, sourceInfo);
        } catch (IOException e) {
            HttpProxyCacheDebuger.printfError("Error fetching info from " + sourceInfo.url, e);
        } finally {
            ProxyCacheUtils.close(inputStream);
            if (urlConnection != null) {

View on GitHub (pinned to e5d74d3aa9)

Solutions

1. Verify the URL in a browser/curl -L and fix the server-side redirect loop
2. Re-acquire a fresh signed URL before playback instead of reusing a stale one
3. Whitelist the captive-portal check: detect portal redirect and prompt the user to sign in
4. If a legitimate chain exceeds 5, fork and raise MAX_REDIRECTS in a custom HttpUrlSource

Example fix

# before
curl -I "https://cdn.example.com/v.mp4?token=stale"
# HTTP 302 -> https://auth.example.com/login
# HTTP 302 -> https://cdn.example.com/v.mp4?token=stale  (loop)

# after - fetch fresh url at play time
String freshUrl = api.getPlaybackUrl(videoId);
player.setUp(proxyCacheServer.getProxyUrl(freshUrl), true, headers);

// detect a redirect loop before playing
String loc = url; int hops = 0;
while (hops++ < 5) {
    HttpURLConnection c = (HttpURLConnection) new URL(loc).openConnection();
    int code = c.getResponseCode();
    if (code/100 == 3) loc = c.getHeaderField("Location"); else break;
}
if (hops >= 5) throw new IllegalArgumentException("redirect loop on " + url);

catch (ProxyCacheException e) {
    if (String.valueOf(e.getMessage()).contains("Too many redirects")) {
        url = api.getFreshPlaybackUrl(videoId); // fresh signed url, then replay
    } else throw e;
}

When it happens

Trigger: A redirect cycle on the origin (common with tokens: url redirects to a login/refresh page that redirects back); a CDN chain longer than 5 hops; a Location header pointing back to the same url; captive portals that redirect every request to a sign-in page.

Common situations: Expired auth tokens causing bounce between content and auth endpoints; hotel/airport captive portals while caching; misconfigured server redirect rules; deep multi-CDN chains (rare but real with geo-routing).

Related errors

• Error starting local proxy server
• Error opening connection for ${sourceInfo.url} with offset $
• Reading source ${sourceInfo.url} is interrupted
• Too many redirects: ${redirectCount}
• Error reading source ${errorsCount} times

AI-assisted analysis of CarGuo/GSYVideoPlayer@e5d74d3aa9 (2026-08-14). Data as JSON: /api/errors/6642bae0024e21c9. Report an issue: GitHub.