StackOverflow2013

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17665771
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2013-07-15T23:45:02.380
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<blockquote> On which point does HTTPURLConnection try to establish a connection to the given URL? </blockquote> On the port named in the URL if any, otherwise 80 for HTTP and 443 for HTTPS. I believe this is documented. <blockquote> On which point can I know that I was able to successfully establish a connection? </blockquote> When you call getInputStream() or getOutputStream() or getResponseCode() without getting an exception. <blockquote> Are establishing a connection and sending the actual request done in one step/method call? What method is it? </blockquote> No and none. <blockquote> Can you explain the function of getOutputStream and getInputStream in layman's term? </blockquote> Either of them first connects if necessary, then returns the required stream. <blockquote> I notice that when the server I'm trying to connect to is down, I get an Exception at getOutputStream. Does it mean that HTTPURLConnection will only start to establish a connection when I invoke getOutputStream? How about the getInputStream? Since I'm only able to get the response at getInputStream, then does it mean that I didn't send any request at getOutputStream yet but simply establishes a connection? Do HttpURLConnection go back to the server to request for response when I invoke getInputStream? </blockquote> See above. <blockquote> Am I correct to say that openConnection simply creates a new connection object but does not establish any connection yet? </blockquote> Yes. <blockquote> How can I measure the read overhead and connect overhead? </blockquote> Connect: take the time getInoutStream() or getOutputStream() takes to return, whichever you call first. Read: time from starting first read to getting the EOS.
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1. POCan you explain the HttpURLConnection connection process?
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1. PTAnswer
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1. USuser207421
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