I am working on some http requests and have hit a problem, one of the requests uses a tick mark (or "check mark") in the post params and I am struggling in VB6 to create it, it is a JSON post via Xmlhttp :
{"utf8":"✓","
When I try to create the post query I am unable to send this character as VB6 see's it as a question mark, hence it does not know what the character is.
Just wondered if anybody has come across this and managed to resolve it ?
Thanks in advance for any help.
Potman
As its JSON the simplest way is to use the JavaScript escape sequence for that Unicode codepoint:
{"utf8":"\u2713", ...
Alternatively in VB6 ChrW$(&H2713) will return this character.
(It will still likely display as ? in the IDE but if you concatenate it to a string and send it via XMLHttp it should work)
Related
Now I tried to make like a translator through Roblox Studio using Https service by sending a request to the translate.google.com link the thing is that anything I get in return does not give me the translated text.
I put what I received in a google doc and tried to find it by pressing ctrl + f to try to find it but no luck the only thing I could find is that text that was supposed to be translated. Here is the code in case you want to try it for yourself but I do warn you that running this might make Roblox unresponsive for a while since it is a lot of info they gave back.
I don't know if I am doing something wrong or not someone please help! I just want it to give me what 'Hello world' would be in french, there are also no error messages.
local http = game:GetService("HttpService")
local Message = "Hello world"
http:UrlEncode(Message) -- 'Hello world' -> 'Hello%20world'
local response = http:RequestAsync(
{
Url = "https://translate.google.com/?sl=en&tl=fr&text=" .. Message .. "!&op=translate";
Method = "GET"
}
)
if response.Success then
print(response.StatusMessage)
print(response.StatusCode)
print(response.Body)
--print(response.Headers)
else
print("The request failed: ", response.StatusCode, response.StatusMessage)
end
When visiting on your browser (for example) the url https://translate.google.com/?sl=en&tl=fr&text=Hello%20World!&op=translate, the translation you see is fetched using Javascript code executed by the browser after loading the page.
The browser retrieves the html body of the page (like you did in your code) and then executes the javascript in the html body which retrieves the translation and updates the page.
Unless you use a browser driver like Selenium I don't see how you can do what you want in a simple way.
Plus, I'm sure that Google has some protection against automatic bots, so after too many request your program will probably will be blocked by ReCaptcha.
The correct way to translate the text is to use the Google Cloud Translate API which I think is free up to 500k requests per month. There is also Azure Translator from Microsoft which also has a free tier.
Your issue is likely in how you are URL Encoding the string.
http:UrlEncode(Message)
HttpService.UrlEncode returns the encoded string as a new value. It doesn't mutate the existing value. So you just need to store the result of the function call.
Message = http:UrlEncode(Message)
EDIT : Just as #Mohamed AMAZIRH pointed out, hitting this URL will only return HTML.
I need help understanding AJAX. I am going through the tutorial on W3C schools ( creating a button that opens text file on the server and displays the result in a div)
One part of the tutorials seems abstract to me, without sufficient explanation. I am sure its a pre-requisite that I have missed or not aware of, detailing below
To avoid getting a cached result in response to an XMLHttpRequest made to the server, the tutorial says one needs to ADD A UNIQUE ID to the URL parameter in the XMLHttp Open Method which has been done (in the tutorial) by adding a ?, another character (t) and an = after the file extention followed by joining a random number to the URL (using Math.random()). See code below.
A simple GET request would be like:
xmlhttp.open("GET","demo_get.asp,true); \\I can understand this
Unique ID added to URL
xmlhttp.open("GET","demo_get.asp?t=" + Math.random(),true); \\ I can't undersatnd this
'?' , 't' & a random number generator added to demo_get.asp - Why T, why not P Q R Z ?? Why "?" after .asp
Should the compiler not go bonkers and report an error if arbitary characters are added to the file location. How is the part of the URL after the file extention handled as in this case ?t= + Math.random()
This has been a case of much agony and frustration for the last 3 days cause I don't get which part of JS i have missed here, what do you call this concept and where can I read it ??
This apart, specifying message headers while sending data - What are HTTP headers and what do they mean. How do I decide what the parameters of the setRequestHeader() method shall be ?
Please help. Rest of Ajax is clear to me.
(I haven't read on the second part - the message headers. I have asked that query here to avoiding posting another question later, just in case it turns out to be as eluding and enigmatic as the UNIQUE ID concept - Apologies in case its a direct simple question I ought to read up myself)
Cache compares the requested URL with those present with it, if a unique id is added to the URL, it does not match and the browser treats it as a fresh GET request, which then is forwarded to the server. This is a standard way to bypass / disable browser caching.
Please refer this document for a better understanding of browser Caching.
See Page No 4, which explains the same thing as stated above.
http://www.f5.com/pdf/white-papers/browser-behavior-wp.pdf
I'm using VBScript and the Microsoft.XMLHTTP object to scrape some web data. I have a list of URLs to check, but unfortunately some of them 301 redirect to others on the list, so I wind up with redundant data.
Is it at all possible to make the XMLHTTP object fail on 301 redirect? Or at least cache the original response header? Or otherwise just let me know what happened?
(notes: I have no control over the server I'm requesting data from; when I get new data, I could check if it's redundant, but I'd like to avoid that if possible).
Any ideas would be greatly appreciated.
First, the ProgId you should be using is MSXML2.XMLHTTP.
The answer is, No - MSXML2.XMLHTTP automatically follows redirects.
If you need to track and optionally not follow redirects, then you can use the WinHttp.WinHttpRequest object, which, like MSXML2.XMLHTTP is accessible to script. In fact this is the object that MSXML2.XMLHTTP delegates to, for http loading.
You'll need to set the WinHttpRequestOptions to EnableRedirects.
See this Q&A on social.msdn.microsoft.com for more.
I am trying to send data to my jsp via:"xhr.send(projectCode);"
but apparently the parameter is not received when I am trying to realise it with System.out.print it is a null displayed.
so the story from the begining. my javascript function send the parameter to the jsp whitch construct an xml file and resend to the first one.
this will reconstruct my second dropdownList with the xml code constructed and received.
so the problem that the parameter dosent sent at all.
What should I do.
Just note in case the syntax whatever you have sent is like this:
url="postjob2.jsp?param=" + param;
After param=" keep a space and then the parameter. My issue got resolved as soon as I entered the space.
The simplest all-round solution is to run your application with a HTTP-tracer, such as fiddler for windows or wireshark. In that way you can see if the proper data is being submitted from your client to the server Given the amount of details you provide, I think this is the best starting point
We are using the Dynamic Script Tag with JsonP mechanism to achieve cross-domain Ajax calls. The front end widget is very simple. It just calls a search web service, passing search criteria supplied by the user and receiving and dynamically rendering the results.
Note - For those that aren’t familiar with the Dynamic Script Tag with JsonP method of performing Ajax-like requests to a service that return Json formatted data, I can explain how to utilise it if you think it could be relevant to the problem.
The service is WCF hosted on IIS. It is Restful so the first thing we do when the user clicks search is to generate a Url containing the criteria. It looks like this...
https://.../service.svc?criteria=john+smith
We then use a dynamically created Html Script Tag with the source attribute set to the above Url to make the request to our service. The result is returned and we process it to show the results.
This all works fine, but we noticed that when using IE the service receives the request from the client Twice. I used Fiddler to monitor the traffic leaving the browser and sure enough I see two requests with the following urls...
Request 1: https://.../service.svc?criteria=john+smith
Request 2: https://.../service.svc?criteria=john+smith&_=123456789
The second request has been appended with some kind of Id. This Id is different for every request.
My immediate thought is it was something to do with caching. Adding a random number to the end of the url is one of the classic approaches to disabling browser caching. To prove this I adjusted the cache settings in IE.
I set “Check for newer versions of stored pages” to “Never” – This resulted in only one request being made every time. The one with the random number on the end.
I set this setting value back to the default of “Automatic” and the requests immediately began to be sent twice again.
Interestingly I don’t receive both requests on the client. I found this reference where someone is suggesting this could be a bug with IE. The fact that this doesn’t happen for me on Firefox supports this theory.
Can anyone confirm if this is a bug with IE? It could be by design.
Does anyone know of a way I can stop it happening?
Some of the more vague searches that my users will run take up enough processing resource to make doubling up anything a very bad idea. I really want to avoid this if at all possible :-)
I just wrote an article on how to avoid caching of ajax requests :-)
It basically involves adding the no cache headers to any ajax request that comes in
public abstract class MyWebApplication : HttpApplication
{
protected MyWebApplication()
{
this.BeginRequest += new EventHandler(MyWebApplication_BeginRequest);
}
void MyWebApplication_BeginRequest(object sender, EventArgs e)
{
string requestedWith = this.Request.Headers["x-requested-with"];
if (!string.IsNullOrEmpty(requestedWith) && requestedWith.Equals(”XMLHttpRequest”, StringComparison.InvariantCultureIgnoreCase))
{
this.Response.Expires = 0;
this.Response.ExpiresAbsolute = DateTime.Now.AddDays(-1);
this.Response.AddHeader(”pragma”, “no-cache”);
this.Response.AddHeader(”cache-control”, “private”);
this.Response.CacheControl = “no-cache”;
}
}
}
I eventually established the reason for the duplicate requests. As I said, the mechanism I chose to use for making Ajax calls was with Dynamic Script Tags. I build the request Url, created a new Script element and assigned the Url to the src property...
var script = document.createElement(“script”);
script.src = https://....”;
Then to execute the script by appending it to the Document Head. Crucially, I was using the JQuery append function...
$(“head”).append(script);
Inside the append function JQuery was anticipating that I was trying to make an Ajax call. If the type of element being appended is a Script, then it executes a special routine that makes an Ajax request using the XmlHttpRequest object. But the script was still being appended to the document head, and being executed there by the browser too. Hence the double request.
The first came direct from the script – the one I intended to happen.
The second came from inside the JQuery append function. This was the request suffixed with the randomly generated query string argument in the form “&_=123456789”.
I simplified things by preventing the JQuery library side effect. I used the native append function...
document.getElementByTagName(“head”).appendChild(script);
One request now happens in the way I intended. I had no idea that the JQuery append function could have such a significant side effect built in.
See www.enhanceie.com/redir/?id=httpperf for further discussion.