I am trying to connect my Broadcom device with the parse cloud, But I am not able to make it work. Does anybody know the procedure ? Please help me out with this problem. Thank you.
You may find this example enlightening.
Essentially, instantiate a TCPClient, connect to the proper URL and port, then build a RESTful request verbatim, using client.println() to send out the headers and a combination of sprintf() and client.print() to issue the data payload.
Related
I am trying to connect to an external API from .net.
It is working as expected from other machines.
But we are not getting any respond from the API call when trying from the server.
We have tried accessing the api url on the browser and it failed with the same no response error.
This is what we have done so far.
We have checked VPC firewall and tried some firewall rules ( Google Cloud firewall) and made sure that there is no blocking to this API.
We have checked Windows firewall and it is switched off now. We also made sure that there is no rules to block this API. However to test it further, we are now switched it off.
Checked that we are able to connect to other websites from the server.
Checked whether we can access the API from other machines. We are able to connect to the API successfully using the tokens from the server.
We have also installed Wireshark to analyze the incoming and outgoing packets from the server. From this analysis, we were able to find that there are network packets sending to this API and it is trying the retransmits the packets, but there is no acknowledgement packet received. This might be of the below two scenarios.
The acknowledgement packet sent from the API server lost in transition.
The data that we have sent from the server to the API lost in transition.
Contacted the API technical team and made sure that the IP is not getting blocked on their end.
Tried contacting Google Support but we have not received much help from them as ours are in "Bronze plan"
This was working without any issues from the server in the past. Not sure what is happening now.
Thank you in advance for all the helps.
Thank you Jeffrey and Patrick for your kind reply. As suggested by Patrick, I am adding here my comments as an answer to close this post. We were able to identify the issue from the wireshark analysis. It was the API provider who was blocking the IP. We have contacted them again with the results and they confirmed this. Thank you very much.
I have the webservice connection url and it's methods.How to call the webservice in java.What are the requirement needed for that (import any api's).
Thanks in advance.
Could you provide for information, and perhaps some code examples?
You don't state if its a java applet, application or servlet.
Generally speaking, in a java applet for example, to "POST" data you would need to create a direct socket connection, construct the correct header for an HTTP post, send it over the socket and then parse the incoming response, again directly. Should be noted that an unsigned java applet can only make direct socket connections to the server it was downloaded from (CodeBase)
Hope this helps.
Darren
Spectral Software Design
I am new to Spring web services. I am going to create an xml request, and send it as a SOAP request to a web service and receive the response.I read different documents but still confused as I could not find a working sample yet.
I know that I should use WebServiceTemplate and WebServiceMessageSender, SaajSoapmessageFactory (please let me know if I am wrong) but not sure how to use them.
Do I need WSDL? if yes why?
If you have any sample code please send me to get clear on it.
Thanks
If you want to send SOAP requests, you would like to be a SOAP client. Seems like you want to use spring-ws project. Check out their great documentation on the client side. The same documentation will guide you through the process of creating a server. There are plenty of examples and ready-made configuration snippets waiting for you.
Spring-WS is built on top of XML Schema description of your message, so you will need WSDL to generate e.g. JAXB models of your requests and responses.
AFAIK, for "web services" , the WSDL file is the machine blueprint of the "ports" as they are called However! ports in WSDL "means" java language(or any other programming language used with a routine or sub or procedure or function) method and has a specific naming scheme associate the .wsdl xml file(template of the service). Each WSDL port(language method) has specifications of return value and data specifications for how to feed it arguments and their type values.
The Scenario:
I'm implementing an FTP get functionality in my application, that uses Qt 4.7.x
Qt documentation states that the QFtp class is deprecated, to use QNetworkAccessManager instead, and so I'm doing ;) I tested the code I wrote with some FTP server out there and it seems to work fine.
The Problem:
When I connect to my local, homebrewed (and quite simple), ftp server using my ftp get class I get the following error: Request: 500 No Help Available.
I traced the ftp communication using tcpdump and actually I see that the QNetworkAccessManager/QNetworkRequest sends an HELP verb to the server, once it gets the 230 User Logged In
Unfortunately my server do not support that. Now is there a way to configure the Qt not to send the HELP verb? Reading the Qt Doc online for the involved classes did not helped.
There is probably no way to avoid this, unless you want to reimplement the FTP backend. By browsing the source code for the FTP backend, you can find out that the purpose for sending the HELP command is to find out if the server supports the "SIZE" and "MDTM" commands.
Probably the easiest solution would be to implement a minimal handler for HELP commands in your FTP server that responds with an appropriate 200/211/214 response.
EDIT: See http://qt.gitorious.org/qt/qt/blobs/4.8/src/network/access/qnetworkaccessftpbackend.cpp#line350 for what the backend expects from the response. It's not complicated.
It is not configurable.
You can see the source code of what's happening here: http://qt.gitorious.org/qt/qt/blobs/4.7/src/network/access/qnetworkaccessftpbackend.cpp#line300
If you can build your own version of Qt, then it can easily be suppressed. But it might be easier for you to upgrade your FTP server to support the HELP command.
Using libcurl, does anybody knows how to determine if a web server supports resuming?
I'm trying to make a custom update software which needs to determine if the web server supports resuming.
Thanks.
I assume you mean HTTP and then there's really no good way to know until you try it.
you can send a HEAD request firstly with RANGE header, then determine with the response header.