Documentaion says:-
ResponseEntity<Mono> or ResponseEntity<Flux> -- this makes the response status and headers known immediately while the body is provided asynchronously at a later point. Whether the body is Mono or Flux depends on how many values the response has.
My usecase is I want the headers right away so that I can do some processes while I wait for the body.
Can anyone help me with a method that would make use of this ?
Related
I understand that cameras that do not have WSBaseNotification feature do not support push-style notifications (Notify), so I have to do the pull-style way (CreatePullPointSubscription and PullMessages).
First I obtain the SubscriptionReference address from CreatePullPointSubscription and pass it to the "To" address in PullMessages. This has succeeded with one of the three cameras I have tested but failed with the other.
Here is a sample of response for CreatePullPointSubscription:
<SOAP-ENV:Header><wsa5:MessageID>urn:uuid:18764990-3fd8-4175-b074-bfdd6816d5a2</
wsa5:MessageID><wsa5:RelatesTo>urn:uuid:1adbe268-c822-eb58-8560-b07639671351</wsa5:RelatesTo><wsa5:To SOAP-
ENV:mustUnderstand="true">http://www.w3.org/2005/08/addressing/anonymous</wsa5:To><wsa5:Action SOAP-
ENV:mustUnderstand="true">http://www.onvif.org/ver10/events/wsdl/EventPortType/
CreatePullPointSubscriptionResponse</wsa5:Action></SOAP-ENV:Header><SOAP-
ENV:Body><tev:CreatePullPointSubscriptionResponse><tev:SubscriptionReference><wsa5:Address>http://172.22.22.35:80/
onvif/device_service?Idx=0</wsa5:Address></tev:SubscriptionReference><wsnt:CurrentTime>2015-11-26T17:05:55Z</
wsnt:CurrentTime><wsnt:TerminationTime>2038-01-19T03:14:07Z</wsnt:TerminationTime></
tev:CreatePullPointSubscriptionResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>
And PulMessagesRequest:
<s:Header><wsa:To>http://172.22.22.35:80/onvi /device_service?Idx=0</wsa:To><wsse:Security><wsse:UsernameToken>
<wsse:Username>admin</wsse:Username><wsse:Password Type="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-username-token-
profile-1.0#PasswordDigest">XWhDcuw3cztspGCLlpQfVaqM1mU=</wsse:Password><wsse:Nonce>NTY1NmNiODFjYTk4MWZlNjFmNDA=</wsse:Nonce>
<wsu:Created>2015-11-26T09:06:09Z</wsu:Created></wsse:UsernameToken></wsse:Security></s:Header><s:Body><tev:PullMessages>
<tev:Timeout>PT5S</tev:Timeout><tev:MessageLimit>2</tev:MessageLimit></tev:PullMessages></s:Body></s:Envelope>
And PullMessagesResponse:
<SOAP-ENV:Header><wsa5:To SOAP-ENV:mustUnderstand="true">http://172.22.22.35:80/onvif
/device_service?Idx=0</wsa5:To></SOAP-ENV:Header><SOAP-ENV:Body><SOAP-ENV:Fault><SOAP-ENV:Code><SOAP-ENV:Value>SOAP-ENV:Sender</SOAP-ENV:Value>
<SOAP-ENV:Subcode><SOAP-ENV:Value>InvalidArgVal</SOAP-ENV:Value></SOAP-ENV:Subcode></SOAP-ENV:Code><SOAP-ENV:Reason><SOAP-ENV:Text
xml:lang="en">InvalidArgVal</SOAP-ENV:Text></SOAP-ENV:Reason><SOAP-
ENV:Detail>There is no subscribe.</SOAP-ENV:Detail></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope>
From the ONVIF core specs:
9.1.2 Pull messages
The device shall provide the following PullMessages command for all SubscriptionManager endpoints returned by the CreatePullPointSubscription command.
Therefore you need to pull the messages from the address returned int the CreatePullPointSubscription . Populating the wsa5:To field in the body of the request but using the URL of the event service is in general not enough.
You posted only the body of the soap requests and not the head, thus it's impossible to check the URL you're using.
I'm very new to LINUX working with node.js. Its just my 2nd day. I use node-curl for curl request. In the link below I have found example with Get request. Can anybody provide me a Post request example using node-curl.
https://github.com/jiangmiao/node-curl/blob/master/examples/low-level.js
You need to use setopt in order to specify POST options for a cURL request. The options you should start looking at first are CURLOPT_POST and CURLOPT_POSTFIELDS. From the libcurl documentation linked from node-curl:
CURLOPT_POST
A parameter set to 1 tells the library to do a regular HTTP post. This will also make the library use a "Content-Type: application/x-www-form-urlencoded" header. (This is by far the most commonly used POST method).
Use one of CURLOPT_POSTFIELDS or CURLOPT_COPYPOSTFIELDS options to specify what data to post and CURLOPT_POSTFIELDSIZE or CURLOPT_POSTFIELDSIZE_LARGE to set the data size.
Optionally, you can provide data to POST using the CURLOPT_READFUNCTION and CURLOPT_READDATA options but then you must make sure to not set CURLOPT_POSTFIELDS to anything but NULL. When providing data with a callback, you must transmit it using chunked transfer-encoding or you must set the size of the data with the CURLOPT_POSTFIELDSIZE or CURLOPT_POSTFIELDSIZE_LARGE option. To enable chunked encoding, you simply pass in the appropriate Transfer-Encoding header, see the post-callback.c example.
CURLOPT_POSTFIELDS
... [this] should be the full data to post in a HTTP POST operation. You must make sure that the data is formatted the way you want the server to receive it. libcurl will not convert or encode it for you. Most web servers will assume this data to be url-encoded.
This POST is a normal application/x-www-form-urlencoded kind (and libcurl will set that Content-Type by default when this option is used), which is the most commonly used one by HTML forms. See also the CURLOPT_POST. Using CURLOPT_POSTFIELDS implies CURLOPT_POST.
If you want to do a zero-byte POST, you need to set CURLOPT_POSTFIELDSIZE explicitly to zero, as simply setting CURLOPT_POSTFIELDS to NULL or "" just effectively disables the sending of the specified string. libcurl will instead assume that you'll send the POST data using the read callback!
With that information, you should be able add the following options to the low-level example to have it make a POST request:
var fieldsStr = '{}';
curl.setopt('CURLOPT_POST', 1); // true?
curl.setopt('CURLOPT_POSTFIELDS', fieldsStr);
You will need to tweak the contents of fieldsStr to match the format the server is expecting. Per the documentation you may also need to url-encode the data - which should be as simple as using encodeURIComponent according to this post.
I'm accessing GMail via IMAP using OAuth2 authentication and Zend_Mail_Protocol_Imap.
It all works great.
What I need to do is present emails in thread form just like the GMail interface. Google make this really easy because they have an X-GM-THRID header that links a conversation with a 64-bit unsigned integer.
My problem is: when presented with a single email, how do I find out what X-GM-THRID it belongs to?
First off Google says that there is a server extension X-GM-EXT-1 which is active. You can check it is there using the CAPABILITY command (and I have).
All the information suggests that if this is active then the X-GM-THRID will simply be returned as a header, but it isn't.
Perhaps I need to ask Google to return it via the fetch command. Google does describe a simple fetch process here:
https://developers.google.com/google-apps/gmail/imap_extensions
My code is sending TAG5 FETCH 3673 (FLAGS RFC822.HEADER X-GM-THRID) but the headers do not include an entry for X-GM-THRID.
I've even simplified it to TAG6 FETCH 3673 (X-GM-THRID) to be exactly as described in the google example. In this case no headers are returned.
I'm not massively familiar with IMAP commands and I'm not sure if Zend_Mail_Protocol_Imap is abstracting some handling which means this header is being removed.
But I do know that this is driving me mad.
Am I missing something? Is it not a header?
Okay, so it looks like it is not a header. It is an attribute in the IMAP command and response.
The standard fetch command sent by Zend_Mail_Protocol_Imap is "TAG5 FETCH 3673 (FLAGS RFC822.HEADER)"
The code that handles the response only expects to be dealing with 'FLAGS' and 'RFC822.HEADER'. It passes this information to a Zend_Mail_Message object which extends Zend_Mail_Part.
Zend_Mail_Part parses information about flag. It also parses the header.
The additional 'X-GM-THRID' attribute that I added does actually get a response. but since it is not passed back to Zend_Mail_Message there is no way for me to use it. It gets lost in the ether (at around line 171 of Zend_Mail_Storage_Imap in my Zend Library to be exact).
So I've hacked the core... Zend_Mail_Storage_Imap::getMessage now expects $data['X-GM-THRID'] and passes it to the constructor Zend_Mail_Part. And I now have a method Zend_Mail_Part::getXGmThrid which solves all my problems. I'll obviously refactor them into my own classes extending Zend_Mail_Storage_Imap and Zend_Mail_Part in the not too distant... but for now I know this works.
I know writing business logic in getters and setters is a very bad programming practice, but is there any way to handle exceptions if the response is already committed?
What exactly is the meaning of "Response already committed" and "Headers are already sent to the client"?
There's no nice way to handle exceptions if the response is already committed. The HTTP response exist basically of a header and a body. The headers basically instruct the client (the webbrowser) how exactly it should deal with the response, e.g. the content type, the content length, the character encoding, the body encoding, the cache instructions, etcetera.
You can see the headers in the HTTP traffic monitor of the webbrowser's developer toolset. Press F12 in Chrome/IE9+/Firefox23+ and check the "Network" tab. The below screenshow is what my Chrome shows on your current question:
(note: the "Response" tab shows the response body)
The response body is the actual content, usually in flavor of a bunch of HTML code. The server has usually a fixed size buffer to write the response to. The buffer size depends on server make/version and configuration and is usually 2KB~10KB. If this buffer overflows, then it will be flushed to the other end of the connection, the client. This is the commit of a response. The client has already obtained the first part of the response, usually already representing the whole bunch of headers and maybe a part of the body.
The commit of a response is a point of no return. The server cannot take the already sent bytes back. It's too late to change the response headers (for example, a redirect is basically instructed by a Location header with therein the new URL), let alone the response body. Best what you can do is to append the error information to the already written response body. But this may end up in some weird looking HTML as it's not known which HTML tags needs to be closed at that point. The browser may fail to present it in a proper manner.
Apart from avoiding business logic in getters so that the exceptions are not thrown while rendering the response, another way to avoid an already committed response is to configure the response buffer size to be as large as the largest page which your webapp can serve. How to do that depends on the server make/version. In Tomcat for example, you can configure it as bufferSize attribute of the <Connector> element. Note that this won't prevent from flushing if your own code is (implicitly) calling flush() on the response output stream.
Good exlanation BalusC and I would add that primefaces has an issue in their exception handler. They try to redirect to error page after request was already committed. And as you said the only solution I found is to add some extra content to the response body. I owerride the handler and add this code
if ( extContext.isResponseCommitted() ) {
PartialResponseWriter writer = context.getPartialViewContext().getPartialResponseWriter();
writer.startElement( "script", null );
writer.write( "window.location.href = '" + errorPageUrl + "';" );
writer.endElement( "script" );
writer.getWrapped().endCDATA();
writer.endElement( "update" );
writer.getWrapped().endDocument();
}
else {
extContext.redirect( errorPageUrl );
context.responseComplete();
}
I am currently working on a project based on varnish..
we write vcl and vmod. But the project needs to check the request body.
How can I get the post request body in VCL or vmod with a C function?
You can do almost everything you want with VCL/VMOD.
You should try to call a VMOD subroutine in vcl_recv, and then in C code, write something like below :
Use VRT_GetHdr(rec->s, HDR_REQ, "\017Content-Length:"); to read the body length
Use HTC_Read(rec->s->htc, body, bodylen);
And enjoy !
You should take a look at existing vmods https://www.varnish-cache.org/vmods, and be free to look into the varnish API sources.
I'm not sure you can.
Varnish generally only deals with Req/Resp headers.
The bodies are passed along without (much) modification.
I you do find a solution please let me know as I'm interested in this as well.