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Java Forum / General / March 2006Jakarta problem
I have this document that I would like to send via HTTP Post. However, the receiving application expects the content data to be sent as a parameter... and the content data can be hundreds of megabytes large. Does there exist an HTTP Client tool that allows you to stream the post request, rather than loading the request into memory up front? > I have this document that I would like to send via HTTP Post. However, > the receiving application expects the content data to be sent as a > parameter... and the content data can be hundreds of megabytes large. When you say "as a parameter", do you mean GET? If so, you may be out of luck. I believe there's a limit on the length of an HTTP URL. - Oliver > When you say "as a parameter", do you mean GET? No, POST. I'm assuming that Jakarta knows enough about post to bury any huge parameter value in the body of the post, right? >No, POST. I'm assuming that Jakarta knows enough about post to bury >any huge parameter value in the body of the post, right? with post, all parameters go in the body. Various sites, e.g. webring, Opera, let you upload photos. You might sniff what is going on there to use as a model. see http://mindprod.com/jgloss/sniffer.html  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. >> When you say "as a parameter", do you mean GET? > > No, POST. I'm assuming that Jakarta knows enough about post to bury > any huge parameter value in the body of the post, right? Okay, so when you say "I have this document that I would like to send via HTTP Post. However, the receiving application expects the content data to be sent as a parameter", why the "however"? What's preventing you from simply using POST? - Oliver > What's preventing you from simply using POST? "... the content data can be hundreds of megabytes large." This is going to be a threaded application handling multiple requests, I don't think loading up Java String objects with several hundred megabytes, and passing them into a PostMethod object using Jakarta's addParameter method is going to fly. >> What's preventing you from simply using POST? > [quoted text clipped - 4 lines] > megabytes, and passing them into a PostMethod object using Jakarta's > addParameter method is going to fly. I looked all over http://jakarta.apache.org/httpcomponents/index.html and couldn't find an API reference, so I don't know what's available to you. If I were doing this, I'd do it manually, forming the HTTP request header, sending it to the socket, then maybe read 1024 bytes a at time from the file, send that through the socket, read another 1024 bytes, send it, and so on. If Jakarta really "forces" you pre-load the entire file in memory, and if that goes against your requirements, I guess you have no choice but to dump Jakarta; at least for this particular feature. - Oliver > I looked all over Yeah, I thought it was kinda wacky that they hide the javadocs from you. You have to drill down into the developer's section to get to the javadocs, IIRC. Thanks! >> I looked all over > > Yeah, I thought it was kinda wacky that they hide the javadocs from > you. You have to drill down into the developer's section to get to the > javadocs, IIRC. See http://svn.apache.org/repos/asf/jakarta/httpcomponents/trunk/http-core/src/examp les/org/apache/http/examples/ElementalHttpPost.java You can provide an InputStream to the request. So provide a FileInputStream. - Oliver > I looked all over http://jakarta.apache.org/httpcomponents/index.html >and couldn't find an API reference, see http://jakarta.apache.org/commons/httpclient/apidocs/index.html SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. >> I looked all over http://jakarta.apache.org/httpcomponents/index.html >>and couldn't find an API reference, > > see http://jakarta.apache.org/commons/httpclient/apidocs/index.html Thanks. I see now the API for PostMethod, and its insistence of receiving pairs of strings as ("name","value) pairs that Slippy was complaining about. I took a look at the code at http://svn.apache.org/repos/asf/jakarta/httpcomponents/trunk/http-core/src/examp les/org/apache/http/examples/ElementalHttpPost.java to see how they did things differently, and it looks like they are using the org.apache.http.message.HttpPost and org.apache.http.HttpEntity classes which don't see to be covered by the "org.apache.commons.httpclient" set of javadocs. - Oliver Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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