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What Does Your User Agent Say About You?

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A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".

(Source: Mozilla.org)

User Agent String

Browser Data

Httpclient User Agent Set

author
Brent Mccoy
• Friday, 30 July, 2021
• 25 min read

Making statements based on opinion; back them up with references or personal experience. Making statements based on opinion; back them up with references or personal experience.

user agent
(Source: play.google.com)

Contents

HTTP is the foundation of data communication for the World Wide Web. The Re-sync() method sends a GET request to the specified URI as an asynchronous operation.

It outputs the simple HTML code of the home page. The GetStringAsync() sends a GET request to the specified URI and returns the response body as a string in an asynchronous operation.

We send an asynchronous POST request with the Apostasy() method. JSON (JavaScript Object Notation) is a lightweight data-interchange format.

This format is easy for humans to read and write and for machines to parse and generate. The official Internet media type for JSON is application/Jason.

We transform the JSON response into a list of Contributor objects with the JsonConvert. DeserializeObject() method. The GetByteArrayAsync() sends a GET request to the specified URI and returns the response body as a byte array in an asynchronous operation.

screen useragent httpclient host request into code
(Source: stackoverflow.com)

In HTTP protocol, basic access authentication is a method for an HTTP user agent (such as a web browser or a console application) to provide a username and password when making a request. In basic HTTP authentication, a request contains a header field in the form of Authorization: Basic , where credentials am the base64 encoding of id and password joined by a single colon :.

Note: The credentials are not encrypted; therefore, HTTP basic authentication must be used with the HTTPS protocol. HTTP Basic authentication is the simplest technique for enforcing access controls to web resources.

HttpClient client = new HttpClient (); HttpRequestMessage request = new HttpRequestMessage(HttpMethod. Get, http://msdn.microsoft.com/ “); request. Headers. Date = Daytime. Now. Subtract(new Time Span(10,0, 0)); request. Headers. UserAgent. ParseAdd(“New User Agent Value”); HttpResponseMessage response = await client. SendAsync(request); string resulted = response. StatusCode. ToString(); But this property is not available for Metro Style App in Win8 Consumer Preview.

HttpWebRequest is a complete implementation of a HTTP request using raw TCP in .NET. Robin MSN Community Support | Feedback to us Get or Request Code Sample from Microsoft Please remember to mark the replies as answers if they help and unmask them if they provide no help.

HttpClient client = new HttpClient (); HttpRequestMessage request = new HttpRequestMessage(HttpMethod. Get, http://msdn.microsoft.com/ “); request. Headers. Date = Daytime. Now. Subtract(new Time Span(10,0, 0)); request. Headers. UserAgent. ParseAdd(“New User Agent Value”); HttpResponseMessage response = await client. SendAsync(request); string resulted = response. StatusCode. ToString(); But this property is not available for Metro Style App in Win8 Consumer Preview.

buntstift faber tri winner headers httpclient damian correctly apache eberhard regenbogen trace wireshark request nikodem sent solution thank always edit
(Source: stackoverflow.com)

HttpWebRequest is a complete implementation of a HTTP request using raw TCP in .NET. Robin MSN Community Support | Feedback to us Get or Request Code Sample from Microsoft Please remember to mark the replies as answers if they help and unmask them if they provide no help.

“An exception to type 'System. FormatException' occurred in System. Net. Http.dll but was not handled in user code Additional information: The format of value '”not submitting” to {RFC2616}' is invalid.” In this post, I'm going to show how to optimally configure a HttpClient using the new HttpClientFactory API in ASP.NET Core 2.1.

Interestingly, the HttpClient and ASP.NET Core does not support compression of GZIP requests, only responses. The HttpClient should retry requests which fail due to transient errors.

Failing fast in this way helps to protect an API or database that may be under high load and means the client gets a failed response quickly rather than waiting for a time-out. The URL, time-out, retry and circuit breaker settings should be configurable from the app settings.Jason file.

It doesn't really matter what the typed client HttpClient looks like, that's not what we're talking about but I include it for context. AddCorrelationId adds a middleware written by Steve Gordon to handle Correlation ID's.

user agent firefox extension zone switchers restart needed bottom works simple line
(Source: www.extension.zone)

The app settings.Jason file below contains the base address for the endpoint we want to connect to, a time-out value of thirty seconds is used if the server is taking too long to respond and policy settings for retries and the circuit breaker. The circuit breaker with the lower limit would kick in first but only break the circuit for a short time, if exceptions are no longer thrown, then things go back to normal quickly.

It starts by setting up and reading a configuration section in our app settings.Jason file of type PolicyOptions. Finally, we add a retry and circuit breaker policy and configure them using the settings we've read from the PolicyOptions.

Notice that each policy is using the HandleTransientHttpError method which tells Polly when to apply the retry and circuit breakers. The AddHttpClient method starts by binding the TClientOptions type to a configuration section in app settings.Jason.

TClientOptions is a derived type of HttpClientOptions which just contains a base address and time-out value. Finally, we add the retry and circuit breaker policies to the HttpClient.

Now the next time you get an error in your API, you'll know the client application that caused it (if it's under your control). To aid in digestion, I've created a GitHub sample project with the full working code.

jmeter agent user properly correct apache httpclient java
(Source: stackoverflow.com)

You can pass a query argument to decide whether the called API will fail or not and try out the retry and circuit breaker logic. Feel free to play with the configuration in app settings.Jason and see what options work best for your application.

An IHttpClientFactory can be registered and used to configure and create HttpClient instances in an app. Provides a central location for naming and configuring logical HttpClient instances.

Codifies the concept of outgoing middleware via delegating handlers in HttpClient. Provides extensions for Polly-based middleware to take advantage of delegating handlers in HttpClient.

Adds a configurable logging experience (via Blogger) for all requests sent through clients created by the factory. The sample code in this topic version uses System. Text. Json to deserialize JSON content returned to HTTP responses.

Using IHttpClientFactory like in the preceding example is a good way to refactor an existing app. In places where HttpClient instances are created in an existing app, replace those occurrences with calls to CreateClient.

agent user log billion learned entries analyzed
(Source: wpfixall.com)

The code can pass just the path, since the base address configured for the client is used. Provide the same capabilities as named clients without the need to use strings as keys.

A typed client accepts an HttpClient parameter in its constructor: For example, the GetAspNetDocsIssues method encapsulates code to retrieve open issues.

The following code calls AddHttpClient in Startup. ConfigureServices to register a typed client class: In the preceding code, AddHttpClient registers GitHubService as a transient service.

Rather than exposing it as a property, define a method which calls the HttpClient instance internally: An implementation of the interface is generated dynamically by the Disservice, using HttpClient to make the external HTTP calls.

Creates an instance of StringContent to package the serialized JSON for sending in the HTTP request's body. Calls EnsureSuccessStatusCode to throw an exception if the response status code does not indicate success.

user agent finder extreme settings vary value
(Source: www.webimagedownloader.com)

Because HTTP DELETE requests typically contain nobody, the DeleteAsync method doesn't provide an overload that accepts an instance of HttpContent. HttpClient has the concept of delegating handlers that can be linked together for outgoing HTTP requests.

Simplifies defining the handlers to apply for each named client. Supports registration and chaining of multiple handlers to build an outgoing request middleware pipeline.

The IHttpClientFactory creates a separate DI scope for each handler. It allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner.

Extension methods are provided to enable the use of Polly policies with configured HttpClient instances. The Polly extensions support adding Polly-based handlers to clients.

Faults typically occur when external HTTP calls are transient. AddTransientHttpErrorPolicy allows a policy to be defined to handle transient errors.

agent user option
(Source: qualysguard.qg2.apps.qualys.com)

AddTransientHttpErrorPolicy provides access to a Policyholder object configured to handle errors representing a possible transient fault: Failed requests are retried up to three times with a delay of 600 ms between attempts.

In the preceding code, if the outgoing request is an HTTP GET, a 10-second timeout is applied. The second AddTransientHttpErrorPolicy call adds a circuit breaker policy.

Further external requests are blocked for 30 seconds if 5 failed attempts to occur sequentially. An approach to managing regularly used policies is to define them once and register them with a PolicyRegistry.

A new HttpClient instance is returned each time CreateClient is called on the IHttpClientFactory. IHttpClientFactory pools the HttpMessageHandler instances created by the factory to reduce resource consumption.

HttpClient instances can generally be treated as .NET objects not requiring disposal. Keeping a single HttpClient instance alive for a long duration is a common pattern used before the inception of IHttpClientFactory.

agent
(Source: support.netpeaksoftware.com)

Stale DNS problems by cycling HttpMessageHandler instances at regular intervals. There are alternative ways to solve the preceding problems using a long-lived SocketsHttpHandler instance.

The SocketsHttpHandler cycles connections according to PooledConnectionLifetime to avoid stale DNS problems. The pooled HttpMessageHandler instances results in CookieContainer objects being shared.

Unanticipated CookieContainer object sharing often results in incorrect code. Clients created via IHttpClientFactory record log messages for all requests.

A client named MyNamedClient, for example, logs messages with a category of “System. Net. Http. Messages suffixed with LogicalHandler occur outside the request handler pipeline.

On the request, messages are logged before any other handlers in the pipeline have processed it. Logging also occurs inside the request handler pipeline.

(Source: my-master.net.ua)

In a console app, add the following package references to the project: Main creates a scope to execute the service's Get Page method and write the first 500 characters of the webpage content to the console.

The client includes the configured headers on outbound requests: Provides a central location for naming and configuring logical HttpClient instances.

Manages the pooling and lifetime of underlying HttpClientMessageHandler instances to avoid common DNS problems that occur when manually managing HttpClient lifetimes. Adds a configurable logging experience (via Blogger) for all requests sent through clients created by the factory.

Using IHttpClientFactory in this fashion is a good way to refactor an existing app. In places where HttpClient instances are currently created, replace those occurrences with a call to CreateClient.

If an app requires many distinct uses of HttpClient, each with a different configuration, an option is to use named clients. In the preceding code, AddHttpClient is called, providing the name GitHub.

httpclient package jsoup android response header same vs difference
(Source: stackoverflow.com)

It can pass just the path, since the base address configured for the client is used. Provide the same capabilities as named clients without the need to use strings as keys.

A typed client accepts an HttpClient parameter in its constructor: The GetAspNetDocsIssues method encapsulates the code needed to query for and parse out the latest open issues from a GitHub repository.

Rather than exposing it as a property, public methods can be provided which call the HttpClient instance internally. An implementation of the interface is generated dynamically by the Disservice, using HttpClient to make the external HTTP calls.

HttpClient already has the concept of delegating handlers that can be linked together for outgoing HTTP requests. The IHttpClientFactory makes it easy to define the handlers to apply for each named client.

It supports registration and chaining of multiple handlers to build an outgoing request middleware pipeline. The pattern provides a mechanism to manage cross-cutting concerns around HTTP requests, including caching, error handling, serialization, and logging.

(Source: osipenkov.ru)

If the header is missing, it can avoid the HTTP call and return a suitable response. Create a custom Syncopal storage object to pass the data.

It allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner. Extension methods are provided to enable the use of Polly policies with configured HttpClient instances.

Most common faults occur when external HTTP calls are transient. A convenient extension method called AddTransientHttpErrorPolicy is included which allows a policy to be defined to handle transient errors.

The extension provides access to a Policyholder object configured to handle errors representing a possible transient fault: Failed requests are retried up to three times with a delay of 600 ms between attempts.

The second call to AddTransientHttpErrorPolicy adds a circuit breaker policy. Further external requests are blocked for 30 seconds if five failed attempts to occur sequentially.

corporate solutions vantage aliases agents user
(Source: www.netsecuritystore.com)

In the preceding code, two policies are registered when the PolicyRegistry is added to the ServiceCollection. A new HttpClient instance is returned each time CreateClient is called on the IHttpClientFactory.

The HttpClient instances can generally be treated as .NET objects not requiring disposal. Keeping a single HttpClient instance alive for a long duration is a common pattern used before the inception of IHttpClientFactory.

Stale DNS problems by cycling HttpMessageHandler instances at regular intervals. There are alternative ways to solve the preceding problems using a long-lived SocketsHttpHandler instance.

The SocketsHttpHandler cycles connections according to PooledConnectionLifetime to avoid stale DNS problems. The pooled HttpMessageHandler instances results in CookieContainer objects being shared.

Unanticipated CookieContainer object sharing often results in incorrect code. Clients created via IHttpClientFactory record log messages for all requests.

httpclient connection unable transport yet f5 ip request curl works failing alive notice difference keep
(Source: stackoverflow.com)

A client named MyNamedClient, for example, logs messages with a category of System. Net. Http. Messages suffixed with LogicalHandler occur outside the request handler pipeline.

On the request, messages are logged before any other handlers in the pipeline have processed it. Logging also occurs inside the request handler pipeline.

This may include changes to request headers, for example, or to the response status code. An IHttpClientBuilder is returned when adding named or typed clients.

Main creates a scope to execute the service's Get Page method and write the first 500 characters of the webpage content to the console. Provides a central location for naming and configuring logical HttpClient instances.

Manages the pooling and lifetime of underlying HttpClientMessageHandler instances to avoid common DNS problems that occur when manually managing HttpClient lifetimes. Adds a configurable logging experience (via Blogger) for all requests sent through clients created by the factory.

agent user
(Source: play.google.com)

Using IHttpClientFactory in this fashion is a good way to refactor an existing app. In places where HttpClient instances are currently created, replace those occurrences with a call to CreateClient.

If an app requires many distinct uses of HttpClient, each with a different configuration, an option is to use named clients. In the preceding code, AddHttpClient is called, providing the name GitHub.

It can pass just the path, since the base address configured for the client is used. Provide the same capabilities as named clients without the need to use strings as keys.

A typed client accepts an HttpClient parameter in its constructor: The GetAspNetDocsIssues method encapsulates the code needed to query for and parse out the latest open issues from a GitHub repository.

Rather than exposing it as a property, public methods can be provided which call the HttpClient instance internally. An implementation of the interface is generated dynamically by the Disservice, using HttpClient to make the external HTTP calls.

agent user
(Source: bestweb4u.net)

HttpClient already has the concept of delegating handlers that can be linked together for outgoing HTTP requests. The IHttpClientFactory makes it easy to define the handlers to apply for each named client.

It supports registration and chaining of multiple handlers to build an outgoing request middleware pipeline. The pattern provides a mechanism to manage cross-cutting concerns around HTTP requests, including caching, error handling, serialization, and logging.

If the header is missing, it can avoid the HTTP call and return a suitable response. The handler must be registered in DI as a transient service, never scoped.

Create a custom Syncopal storage object to pass the data. It allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback in a fluent and thread-safe manner.

Extension methods are provided to enable the use of Polly policies with configured HttpClient instances. Most common faults occur when external HTTP calls are transient.

(Source: hocphp.info)

Failed requests are retried up to three times with a delay of 600 ms between attempts. In the preceding code, if the outgoing request is an HTTP GET, a 10-second timeout is applied.

It's common to nest Polly policies to provide enhanced functionality: The second call to AddTransientHttpErrorPolicy adds a circuit breaker policy.

Further external requests are blocked for 30 seconds if five failed attempts to occur sequentially. An approach to managing regularly used policies is to define them once and register them with a PolicyRegistry.

An extension method is provided which allows a handler to be added using a policy from the registry: In the preceding code, two policies are registered when the PolicyRegistry is added to the ServiceCollection.

A new HttpClient instance is returned each time CreateClient is called on the IHttpClientFactory. IHttpClientFactory pools the HttpMessageHandler instances created by the factory to reduce resource consumption.

(Source: osipenkov.ru)

To override it, call SetHandlerLifetime on the IHttpClientBuilder that is returned when creating the client: The HttpClient instances can generally be treated as .NET objects not requiring disposal.

Keeping a single HttpClient instance alive for a long duration is a common pattern used before the inception of IHttpClientFactory. Stale DNS problems by cycling HttpMessageHandler instances at regular intervals.

There are alternative ways to solve the preceding problems using a long-lived SocketsHttpHandler instance. The SocketsHttpHandler cycles connections according to PooledConnectionLifetime to avoid stale DNS problems.

The pooled HttpMessageHandler instances results in CookieContainer objects being shared. Unanticipated CookieContainer object sharing often results in incorrect code.

Clients created via IHttpClientFactory record log messages for all requests. A client named MyNamedClient, for example, logs messages with a category of System. Net. Http.

agent useragent detector
(Source: github.com)

Messages suffixed with LogicalHandler occur outside the request handler pipeline. On the request, messages are logged before any other handlers in the pipeline have processed it.

Logging also occurs inside the request handler pipeline. This may include changes to request headers, for example, or to the response status code.

An IHttpClientBuilder is returned when adding named or typed clients. Main creates a scope to execute the service's Get Page method and write the first 500 characters of the webpage content to the console.

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Sources
1 ask.wireshark.org - https://ask.wireshark.org/question/15831/how-to-find-user-agent-string-in-wireshark/
2 unit42.paloaltonetworks.com - https://unit42.paloaltonetworks.com/using-wireshark-identifying-hosts-and-users/
3 osqa-ask.wireshark.org - https://osqa-ask.wireshark.org/questions/9321/browser-user-agent
4 serverfault.com - https://serverfault.com/questions/646063/user-agent-in-http-or-https-request
5 www.wireshark.org - https://www.wireshark.org/docs/wsug_html/
6 www.wireshark.org - https://www.wireshark.org/docs/dfref/h/http.html
7 developer.mozilla.org - https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/User-Agent
8 ask.wireshark.org - https://ask.wireshark.org/questions/scope:unanswered/sort:age-desc/tags:homework,string,agent,user/page:1/