I need to send the HTTP Request to the URL of online Data Management Systems. I am using the following codes:
public async Task StartCrawl()
{
var url = "http://pww.comopsdms.healthcare.philips.com/livelink/llisapi.dll?func=ll&objId=3890195&objAction=browse&sort=name&viewType=1";
var httpClient = new HttpClient();
var html = await httpClient.GetStringAsync(url);
var htmlDoc = new HtmlAgilityPack.HtmlDocument();
}
Here, it works with all the other URL links but does not work with the above link. HttpClient sends the request but receives nothing. And flow does not go to the next line.
The link only works inside the company network.
Related
I need to call a Custom protocol (something like: "custom:signDocs?param1=value?param2=value") that is registered on a client.
I have a working one that is executed via JavaScript on a button click.
But I need to call the url to execute the program I have on the clients pc.
The program is for signing documents and sending them back to the server, and, in the code I have a 15min timer that waits for the status of the documents to change to signed then it shows the documents to the user.
I also tried using webrequest:
//Method that uses the webrequest
{
System.Net.WebRequest.RegisterPrefix("customProtocolName", new PrototipoIDPTRequestCreator());
System.Net.WebRequest req = System.Net.WebRequest.Create(protocolUrlWithParams);
var aux = req.GetResponse();
}
internal class CustomRequestCreator : System.Net.IWebRequestCreate
{
public WebRequest Create(Uri uri)
{
return new CustomWebRequest(uri);
}
}
class CustomWebRequest: WebRequest
{
public override Uri RequestUri { get; }
public CustomWebRequest(Uri uri)
{
RequestUri = uri;
}
}
But this does nothing, I do not know it its even the right path...
Does anyone know of a way to accomplish this?
You can use HttpClient from System.Net.Http like the following example.
Simple get call from a test api endpoint.
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("YOUR_BASE_URL"); //https://localhost:8000
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(
new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = await client.GetAsync("api/test"); //api uri
response.EnsureSuccessStatusCode();
string responseBody = await response.Content.ReadAsStringAsync();
}
Note: For more details refer, HttpClient Doc
Running calls to the Design Automation API in Postman works just fine but when I try to make the same calls in C# using HttpClient they fail with a 404 that seems to actually hide an authentication error:
{
"developerMessage":"The requested resource does not exist.",
"userMessage":"",
"errorCode":"ERR-002",
"more info":"http://developer.api.autodesk.com/documentation/v1/errors/err-002"
}
That link leads to an authentication error:
<Error>
<Code>AccessDenied</Code>
<Message>Access Denied</Message>
<RequestId>1F52E60A45AEF429</RequestId>
<HostId>
[ Some base64 ]
</HostId>
</Error>
I'm following examples for how to use HttpClient, but I may be missing something. I successfully get the access token, run
var client = new HttpClient
{
BaseAddress = new Uri("https://developer.api.autodesk.com/da/us-east")
};
client.DefaultRequestHeaders.Authorization =
new System.Net.Http.Headers.AuthenticationHeaderValue(TokenType, AccessToken);
then
var result = await client.GetAsync("/v3/forgeapps/me");
and the above json is the result's content. I use the same access token in Postman and it works.
I would wrap up the endpoint, headers, and httpmethod in the HttpRequestMessage. Then send it and assign it to HttpResponseMessage.
var client = new HttpClient
{
BaseAddress = new Uri("https://developer.api.autodesk.com/da/us-east/")
};
//throw the endpoint and HttpMethod here. Could also be HttpMethod.Post/Put/Delete (for your future reference)
var request = new HttpRequestMessage(HttpMethod.Get, "v3/forgeapps/me");
//also maybe try throwing the headers in with the request instead of the client
request.Headers.Add(TokenType, AccessToken);
// send the request, assign to response
HttpResponseMessage response = await client.SendAsync(request);
//then, we can grab the data through the Content
string result = await response.Content.ReadAsStringAsync();
I need to perform an HTTP GET operation while following redirects.
using (var client = new HttpClient())
{
var response = await client.GetAsync("https://example.com");
}
Problem is that if the server returns a 302 HTTP code redirecting to http://... (not https), .NET does not follow it (for security reasons).
How do I force HttpClient to follow redirects from HTTPS to HTTP?
You may have to do a little bit of extra work:
using var client = new HttpClient();
var response = await client.GetAsync("https://example.com");
if (new[] {HttpStatusCode.Moved, HttpStatusCode.MovedPermanently}.Contains(response.StatusCode))
{
response = await client.GetAsync(response.Headers.Location);
}
// more code
I've been having a few issues in trying to retrieve the results of a POST operation from a Web Service.
I have been using a chrome extension to test the API Services and they are working there. However I've been having problems on implementing it in code.
This is an example of usage of the chrome extension:
What I'm trying to retrieve on code, is the last part, the json array that the POST operation generates, where it says accessToken.
However, in the code that I've been using below, I've only had access to the status (200 OK) etc.
Here's a preview of the code I am using:
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri(url.Text);
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(header.Text));
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, url.Text);
request.Content = new StringContent(body.Text, Encoding.UTF8, header.Text);
client.SendAsync(request)
.ContinueWith(responseTask =>
{
MessageBox.Show(responseTask.Result.Content.Headers.ToString());
}
);
}
The Header.Text is exactly "application/json", the body.Text is body which has those various properties such as username and password (in string format) and url.Text contains the complete URL to call the Web service.
I'd like to know what I'm doing wrong with my code, and what can I do to obtain that json array that contains the accessToken
In your code you need to use ReadAsStringAsync method to convert your HttpContent object to string/json. For example:
client.SendAsync(request)
.ContinueWith(responseTask =>
{
var jsonString = responseTask.Result.Content.ReadAsStringAsync().Result;
MessageBox.Show(jsonString);
});
then you can convert you jsonString as you need.
In my application I passed a request api url and when I try to open the link it shows the Json data in the browser. But when I try to deserialize the Json data I got 404 status.
Uri geocodeRequest = new Uri(string.Format("https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=17.4271,078.4466&radius=500&type=petrol_bunk&key=MyKey"));
HttpClient client = new HttpClient();
HttpResponseMessage response = await client.GetAsync(geocodeRequest);
if(response.IsSuccessStatusCode==true)
{
When I open this link I can see the Json data but when I try this link in my code the status shows 404 error(No data resources). Also please check this link for the image displayed while debugging my project
It should be about the refuse from the server.
The different between using HttpClient & Web browser to browse website is
"You don't have the same header and method"
Let's try adding other header parameters like Agent,Content-type, Content-length
var client = new HttpClient();
var request = new HttpRequestMessage() {
RequestUri = new Uri("http://www.someURI.com"),
Method = HttpMethod.Get,
...........
};
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain")); }