following a log file over http
Question
For security reasons (I'm a developer) I do not have command line access to our Production servers where log files are written. I can, however access those log files over HTTP. Is there a utility in the manner of "tail -f" that can "follow" a plain text file using only HTTP?
Solution
You can do this if the HTTP server accepts requests to return parts of a resource. For example, if an HTTP request contains the header:
Range: bytes=-500
the response will contain the last 500 bytes of the resource. You can fetch that and then parse it into lines, etc. I don't know of any ready-made clients which will do this for you - I'd write a script to do the job.
You can use Hurl to experiment with headers (from publicly available resources).
OTHER TIPS
I wrote a bash script for the same purpose. You can find it here https://github.com/maksim07/url-tail
You can use small java utility to read log file over Http using Apche HTTP Library.
HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet(uri);
HttpResponse response = client.execute(request);
BufferedReader rd = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
String s = "";
while ((s = rd.readLine()) != null) {
//Process the line
}
You can use PsExec to execute command on remote computer. The tail command for windows can be found at http://tailforwin32.sourceforge.net/
If it has to be HTTP, you can write a light weight web service to achieve that easily. e.g., read text within a specified file from line 0 to line 200.