Connection is never reused if response is gzip with non-negative Content-Length
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                 Key: HTTPCLIENT-1085
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1085
             Project: HttpComponents HttpClient
          Issue Type: Improvement
          Components: HttpClient
    Affects Versions: 4.1.1
            Reporter: Daniel Rabe
            Priority: Minor


While debugging a separate issue, I noticed that DefaultConnectionReuseStrategy 
is very sensitive to whether the server returns a positive content-length or 
content-length=-1 with chunked encoding. In particular, I saw two cases:
(1) Server returns gzip response with Content-Length=-1, chunked encoding. The 
connection is reused.
(2) Server returns gzip response with 
Content-Length=<actual-number-of-bytes-in-response> The connection is NOT 
reused.

This is because of the following code in DefaultConnectionReuseStrategy:

           if (entity.getContentLength() < 0) {
                if (!entity.isChunked() ||
                    ver.lessEquals(HttpVersion.HTTP_1_0)) {
                    // if the content length is not known and is not chunk
                    // encoded, the connection cannot be reused
                    return false;
                }
            }

GzipDecompressingEntity implements its getContentLength as always returning -1. 
However, it is not chunked. Therefore, the connection is not reused.

I'm not sure if you would consider this a bug or a request for enhancement, but 
it seems to me that if the server is returning an accurate content-length, the 
client should be able to consume that number of bytes, then reuse the 
connection.


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