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https://issues.apache.org/jira/browse/HTTPCLIENT-1854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16046668#comment-16046668
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Nicholas DiPiazza edited comment on HTTPCLIENT-1854 at 6/12/17 3:23 PM:
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I tried to call
{code}
read(scratch, totalRead, n)
{code}
in a loop but this does not work.
Upon further inspection, I called
{code}
available()
{code}
it returns 439, but the length of the stream is 4000.
So I fetch those 439 characters using read and then I go to get the next using
the read(bytes, offset, total)
I call
{code}
available()
{code}
a second time, it returns 0.
was (Author: ndipiazza):
I tried to call {{{read(scratch, totalRead, n)}}} in a loop but this does not
work.
Upon further inspection, I called {{{available()}}} it returns 439.
I fetch those 439 characters using {{{read(scratch, totalRead, n)}}}
I call {{{available()}}} a second time, it returns 0.
> Cannot peek contents of org.apache.http.conn.EofSensorInputStream
> -----------------------------------------------------------------
>
> Key: HTTPCLIENT-1854
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1854
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Affects Versions: 4.5.2
> Reporter: Nicholas DiPiazza
>
> I am trying to peek at an input stream contents from HttpClient, up to 64k
> bytes.
> The stream comes from an HttpGet, nothing unusual about it:
> {code}
> HttpGet requestGet = new HttpGet(encodedUrl);
> HttpResponse httpResponse = httpClient.execute(requestGet);
> int status = httpResponse.getStatusLine().getStatusCode();
> if (status == HttpStatus.SC_OK) {
> return httpResponse.getEntity().getContent();
> }
> {code}
> The input stream it returns is of type
> org.apache.http.conn.EofSensorInputStream
> Our use-case is such that we need to "peek" at the first (up to 64k) bytes of
> the input stream. I use an algorithm described here How do I peek at the
> first two bytes in an InputStream?
> {code}
> PushbackInputStream pis = new PushbackInputStream(inputStream,
> DEFAULT_PEEK_BUFFER_SIZE);
> byte [] peekBytes = new byte[DEFAULT_PEEK_BUFFER_SIZE];
> int read = pis.read(peekBytes);
> if (read < DEFAULT_PEEK_BUFFER_SIZE) {
> byte[] trimmed = new byte[read];
> System.arraycopy(peekBytes, 0, trimmed, 0, read);
> peekBytes = trimmed;
> }
> pis.unread(peekBytes);
> {code}
> When I use a ByteArrayInputStream, this works with no problem.
> When using the org.apache.http.conn.EofSensorInputStream I only get a small
> number of bytes at the beginning of the stream. usually around 400 bytes.
> When I expected up to 64k bytes.
> I also tried using a BufferedInputStream where I read up to the first 64k
> bytes then call a .reset() but that doesn't work either. Same issue.
> Why might this be? I do not think anything is closing the stream because if
> you call IOUtils.toString(inputStream) I do get all the content.
> See
> https://stackoverflow.com/questions/44474191/is-it-possible-to-peek-httpclients-org-apache-http-conn-eofsensorinputstream
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