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https://issues.apache.org/jira/browse/HTTPCLIENT-2164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Oleg Kalnichevski resolved HTTPCLIENT-2164.
-------------------------------------------
Resolution: Not A Problem
> HttpResponseInterceptor connection is closed when response body is empty
> ------------------------------------------------------------------------
>
> Key: HTTPCLIENT-2164
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2164
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient (classic)
> Affects Versions: 4.5.13
> Environment: MacOS/Linux
> Reporter: Jared S
> Priority: Major
>
> I am trying to use an HttpResponseInterceptor to view server certificates
> returned during the TLS handshake. The following code snippet works fine -
> unless the server response has an empty body. Then, it fails with a
> ConnectionShutdownException. This feels like a bug - an empty response body
> (i.e. a 204) is valid, so I don't see why it should behave so differently
> from a 200 with content.
>
> {code:java}
> public class Run {
> public static void main(String[] args) throws URISyntaxException, IOException
> {
> HttpClientBuilder httpClientBuilder = HttpClients.custom();
> httpClientBuilder.addInterceptorLast((HttpResponseInterceptor) (response,
> context) -> {
> ManagedHttpClientConnection connection =
> (ManagedHttpClientConnection)
> context.getAttribute(HttpCoreContext.HTTP_CONNECTION);
> System.out.println("Response: " + response);
> System.out.println("Connection: " + connection);
> SSLSession sslSession = connection.getSSLSession();
> if (sslSession != null) {
> context.setAttribute("certificateChain",
> sslSession.getPeerCertificates());
> }
> });
> CloseableHttpClient httpClient = httpClientBuilder.build();
> final HttpContext context = new BasicHttpContext();
> final HttpPut put = new HttpPut();
> put.setURI(new
> URI("https://<redacted>.execute-api.us-east-1.amazonaws.com/Prod"));
> httpClient.execute(put, context);
> for (X509Certificate cert : (X509Certificate[])
> context.getAttribute("certificateChain")) {
> System.out.println(cert.getSubjectX500Principal());
> }
> }
> {code}
> I used AWS API Gateway to set up a minimal server. When the backend is set to
> {code:java}
> def lambda_handler(event, context):
> # TODO implement
> return {
> 'statusCode': 200,
> 'body': "hello world",
> 'isBase64Encoded': False
> }
> {code}
> then the client works fine:
> {code:java}
> Response: HttpResponseProxy{HTTP/1.1 200 OK [Date: Tue, 22 Jun 2021 16:04:36
> GMT, Content-Type: application/json, Content-Length: 11, Connection:
> keep-alive, x-amzn-RequestId: 097b2037-62b1-48fd-b28e-95fb679ba696,
> x-amz-apigw-id: BVaDPHS6IAMFSfA=, X-Amzn-Trace-Id:
> Root=1-60d20a14-2e49fa58675b563e763acbc7;Sampled=0]
> ResponseEntityProxy{[Content-Type: application/json,Content-Length:
> 11,Chunked: false]}}
> Connection: CPoolProxy{10.95.216.212:51737<->52.200.70.32:443}
> CN=*.execute-api.us-east-1.amazonaws.com
> CN=Amazon, OU=Server CA 1B, O=Amazon, C=US
> CN=Amazon Root CA 1, O=Amazon, C=US
> CN=Starfield Services Root Certificate Authority - G2, O="Starfield
> Technologies, Inc.", L=Scottsdale, ST=Arizona, C=US
> {code}
> However, if I set the backend to instead be:
> {code:java}
> def lambda_handler(event, context):
> # TODO implement
> return {
> 'statusCode': 204,
> 'body': None,
> 'isBase64Encoded': False
> }
> {code}
>
> then it fails with
> {code:java}
> Exception in thread "main"
> org.apache.http.impl.conn.ConnectionShutdownException
> at
> org.apache.http.impl.conn.CPoolProxy.getValidConnection(CPoolProxy.java:77)
> at
> org.apache.http.impl.conn.CPoolProxy.getSSLSession(CPoolProxy.java:137)
> at <redacted>.client.Run.lambda$main$0(Run.java:33)
> at
> org.apache.http.protocol.ImmutableHttpProcessor.process(ImmutableHttpProcessor.java:142)
> at
> org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:191)
> at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
> at
> org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
> at
> org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
> at
> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
> at <redacted>.client.Run.main(Run.java:42)
> {code}
> The same happens if I return a 200 (as opposed to a 204) with an empty body.
> Note CPoolProxy\{detached} when it fails versus
> CPoolProxy\{10.95.216.212:65140<->54.197.189.189:443} when it works.
> I don't know of any other way to get the certificates, so I'm marking this as
> a major loss in functionality.
> There is an old ticket relating to a closed connection from a 204, but this
> is so old I can't imagine it could be the cause:
> https://issues.apache.org/jira/browse/HTTPCLIENT-464
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