http-content-length | 易学教程

Are HTTP keep-alive connections possible without content-length headers?

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问题 I understand that in HTTP 1.0, the content of a response is terminated by closing the connection. In HTTP 1.1, keep-alive connections were introduced, enabling multiple requests and responses in a single TCP connection. When multiple messages are sent over the same connection, there needs to be a mechanism that defines where one message ends and the next message starts. By testing, I found out that this works when I set the content-length header in a response. By knowing the content length,

HTTP Content-Length and Chunked Transfer-Encoding. Is there a 2GB Limit?

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问题 Is a HTTP Content-Length over 2GB or 4GB supported by modern webservers? How about the chunks in HTTP Chunked Transfer Encoding? Can an individual HTTP chunk exceed 2GB in length? I need to know to use 32-bit integers or 64-bit integers in my code. 回答1: From what I have gathered, 64-bit limits are new, especially in the web browsers. Chrome supports them, Opera maybe, and I see a patch for Firefox that hasn't landed yet. I've read posts that say IE returns negative Content-Length , which

Why does Content-Length HTTP header field use a value other than the one given in Java code?

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问题 I have a piece of Java code to transfer a byte array to HTTP server: HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoInput(true); connection.setDoOutput(true); connection.setUseCaches(false); connection.setRequestMethod("POST"); connection.setRequestProperty("Connection", "Keep-Alive"); connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + myBoundary); connection.setRequestProperty("Content-Length", 1024); I used this code to

HTTP Head method Content-Length does not match with size on “View Page info”

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问题 Please forgive my lack of understanding on this subject. I had bunch of urls that I am interested to know the size of its web page. So, I used HTTP Head req method to get the Content-Length. I verified the Content-Length values generated from Head method by opening some of those urls in a browser (I used Firefox) and checking the "View Page Info" (from right-click on website in browser) option that gives the "Size:". For most of the urls, both the values matches but not for some. I wonder why

PHP file_get_contents() follow Content-length header

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问题 i'm using code like this: //section with the important stuff for the client ob_start(); echo "Blah... Random Content" . rand(1,1000); $size = ob_get_length(); header("Content-Length: $size"); header('Connection: close'); ob_end_flush(); ob_flush(); flush(); //all the following output/script running time should be ignored by the client (file_get_contents()) sleep(10); echo "long action completed"; to output some content and subsequently running a time consuming background job. In a other file

ASP.NET Web Api - the framework is not converting JSON to object when using Chunked Transfer Encoding

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I have an http client in Android sending HTTP PUT requests to a REST api implemented with C# and ASP.NET WebApi framework. The framework should be able to magically convert (deserialize) the JSON into a model class (plain object) as long as the JSON fields match the properties in the C# class. The problem comes when the http requests come with Chunked Transfer Encoding that makes the Content-Length = 0 (as per http://en.wikipedia.org/wiki/Chunked_transfer_encoding ) and the framework is not able to map the JSON that's within the Http request message so the parameter is null. See this simple

How do I disable 'Transfer-Encoding: chunked' encoding in Varnish?

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Using Varnish 4 , I have a set of backends that're responding with a valid Content-Length header and no Transfer-Encoding header. On the first hit from a client, rather than responding to the client with those headers, Varnish is dropping the Content-Length header and adding Transfer-Encoding: chunked to the response. (Interestingly, the payload doesn't appear to have any chunks in it - it's one contiguous payload). This causes serious problems for clients like Flash video players that are trying to do segment-size, bandwidth, etc analysis based on the Content-Length header. Their analysis

HTTP Content-Length and Chunked Transfer-Encoding. Is there a 2GB Limit?

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Is a HTTP Content-Length over 2GB or 4GB supported by modern webservers? How about the chunks in HTTP Chunked Transfer Encoding? Can an individual HTTP chunk exceed 2GB in length? I need to know to use 32-bit integers or 64-bit integers in my code. From what I have gathered, 64-bit limits are new, especially in the web browsers. Chrome supports them, Opera maybe, and I see a patch for Firefox that hasn't landed yet. I've read posts that say IE returns negative Content-Length , which means it's likely to use 32-bits. 64-bit HTTP lengths looks like the future, but we aren't there yet. 来源： https:

How is an HTTP multipart “Content-length” header value calculated?

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问题 I've read conflicting and somewhat ambiguous replies to the question "How is a multipart HTTP request content length calculated?". Specifically I wonder: What is the precise content range for which the "Content-length" header is calculated? Are CRLF ("\r\n") octet sequences counted as one or two octets? Can someone provide a clear example to answer these questions? 回答1: The following live example should hopefully answer the questions. Perform multipart request with Google's OAuth 2.0

How is an HTTP multipart “Content-length” header value calculated?

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I've read conflicting and somewhat ambiguous replies to the question "How is a multipart HTTP request content length calculated?". Specifically I wonder: What is the precise content range for which the "Content-length" header is calculated? Are CRLF ("\r\n") octet sequences counted as one or two octets? Can someone provide a clear example to answer these questions? The following live example should hopefully answer the questions. Perform multipart request with Google's OAuth 2.0 Playground Google's OAuth 2.0 Playground web page is an excellent way to perform a multipart HTTP request against