Home » [Update] Robots.txt Middleware For ASP.NET Core | asp robot – Nangdep.vn

[Update] Robots.txt Middleware For ASP.NET Core | asp robot – Nangdep.vn

asp robot: คุณกำลังดูกระทู้

As a web developer, it’s important to remind ourselves that we push our work onto the internet for the world to see. Our development team utilizes Windows Azure for many environments, and all those environments need to be publicly accessible. There are ways to limit accessibility on Windows Azure, but the eyes looking at our work can vary, so having a hard constraint becomes unmanageable for us.

The accessibility of our environments helps stakeholders see iterations of our progress faster and provide feedback. In turn, that feedback goes back into our development, making the deliverable better for everyone.

In practice, we usually have three environments in Windows Azure App Services: Development, Staging, and Production. We want all these to be visible to people, but we all know people don’t just view the web. The majority of web users are automated processes that scan your site, and many other sites to provide search results. I put a generous amount of effort into a previous blog post and proud of it. If you want to learn how to build a great search experience in your ASP.NET Core application, I highly recommend it.

In this post, I’ll explain why a robots.txt is essential for your public-facing ASP.NET Core applications. Additionally, you’ll learn how to write or generate a few variations of the file. Finally, you’ll learn how to serve a specific file based on your current hosting environment.

This post is by no means limited to Windows Azure users and works anywhere you host your ASP.NET Core applications.

If you want the code, you can download it from my GitHub repository. It targets ASP.NET Core 3.0 but could be modified to support lower SDK versions.

Download the Project

What is a Robots.txt

As mentioned in the previous section, most of the web’s users are automated processes. These processes are known as Web crawlers and operated by data collection and search companies like Google, Facebook, and Microsoft.

Wikipedia sums it perfectly:

A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web, typically for the purpose of Web indexing (web spidering). –Wikipedia

While algorithms can differ, most crawlers start at your homepage and navigate the links on your site in an attempt to find the most content. However, the exciting fact is, you can talk to these crawlers!

If talking to spiders makes your skin crawl, don’t worry, I promise there won’t be any insects involved. Instead, there is a simple plain text file called a robots.txt file. This file contains instructions for crawlers, telling them where to look in your site for meaningful content, and even where not to look. As reiterated on Wikipedia:

The robots exclusion standard, also known as the robots exclusion protocol or simply robots.txt, is a standard used by websites to communicate with web crawlers and other web robots. The standard specifies how to inform the web robot about which areas of the website should not be processed or scanned.–Wikipedia

It’s important to note that the instructions in the file are no guarantee that a crawler obeys your wishes. There are bad bots that crawl sites for many other reasons, especially if your site contains valuable information.

See also  [Update] | ย่านคนรวย เกาหลี - Nangdep.vn

Why It is Important

I’m glad you are asking the question:

Why is it essential to have a robots.txt file for my ASP.NET Core application?

While you may not have content within your application, you still want individuals to find your primary domain. Pointing crawlers to the specific pages to you and your users can make for a more significant impact.

In my case, we have multiple domains that can have very similar content. Crawlers may mistake the variations in domains having similar content as an attempt to create spam sites. The duplication of sites can hurt the overall ranking of a site in search engine results.

Even worse, your non-primary sites could rank higher than your primary! Imagine users entering critical information into your development environment, only for it to be lost. Yikes!

Generating Your Own Robots.txt

A robots.txt has a few components, but the essential parts are who and what.
Whom do you want to scan your site?
What parts of the site do you want to be indexed?
Let’s take a simple robots.txt file:

User-Agent: *
Allow: /

The first line of the file defines what User-Agent can scan the site. The User-Agent is a string value passed from the client. For example, Google’s bot passes a value of Googlebot, but they also have an army of bots.

The second line of the file tells the bot what it can index. The example informs the bot to start at the root path and work its way everywhere it can. You can also Disallow specific paths, but don’t assume this takes the place of securing your site. As mentioned before, bots do not have to respect the robots.txt file.

I recommend generating a few variations using this online tool. As the tool mentions, you can damage your site’s search results if done incorrectly, so be careful and think through the file you’ll be serving.

serving the https://d33wubrfki0l68.cloudfront.net/19881b5332448a7e288ec5df01c957770c886e89/f67b2/robots.txt

The Code

You’ve learned a lot up to this point:

  • You know what a crawler is
  • How to talk to them via a robots.txt file
  • Have generated a few variations

In this section, I’ll show you how to write a piece of middleware that takes inspiration for ASP.NET Core’s use of environments. Our goal is to serve a robots.txt file unique to each environment we have.

We want to tell bots to stay away from our development environments while boosting the importance of our production sites.

Robots.txt Per Environment

The first step is to realize that ASP.NET Core provides an Environment mechanism. By default, we get Development, Staging, and Production. We can create any environments, but let’s start here.

asp.net core environments

Our robots.txt files can match these environments:

robots.txt
robots.Production.txt
robots.Development.txt

The robots.txt is our fallback, but the other files are specific to the environments. ASP.NET Core reads the current environment value from the environmental variable ASPNETCORE_ENVIRONMENT which can be set at runtime or via launch settings.

Robots.txt Middleware Code

The middleware is straight-forward. It scans our directory for the files based on our environments. In my sample, I place the files in the content path of the project, and not the webroot path. You could place it anywhere, but in general, I don’t want the static file middleware to serve the incorrect file accidentally.

public

static

class

RobotsTxtMiddlewareExtensions

{

public

static

IApplicationBuilder

UseRobotsTxt

(

this

IApplicationBuilder

builder

,

IWebHostEnvironment

env

,

string

rootPath

=

null

)

{

return

builder

.

MapWhen

(

ctx

=>

ctx

.

Request

.

Path

.

StartsWithSegments

(

"/robots.txt"

),

b

=>

b

.

UseMiddleware

<

RobotsTxtMiddleware

>(

env

.

EnvironmentName

,

rootPath

??

env

.

ContentRootPath

));

}

}

public

class

RobotsTxtMiddleware

{

const

string

Default

=

@"User-Agent: *\nAllow: /"

;

private

readonly

RequestDelegate

next

;

private

readonly

string

environmentName

;

private

readonly

string

rootPath

;

public

RobotsTxtMiddleware

(

RequestDelegate

next

,

string

environmentName

,

string

rootPath

)

{

this

.

next

=

next

;

this

.

environmentName

=

environmentName

;

this

.

rootPath

=

rootPath

;

}

public

async

Task

InvokeAsync

(

HttpContext

context

)

{

if

(

context

.

Request

.

Path

.

StartsWithSegments

(

"/robots.txt"

))

{

var

generalRobotsTxt

=

Path

.

Combine

(

rootPath

,

"robots.txt"

);

var

environmentRobotsTxt

=

Path

.

Combine

(

rootPath

,

$"robots.

{

environmentName

}

.txt"

);

string

output

;

// try environment first

if

(

File

.

Exists

(

environmentRobotsTxt

))

{

output

=

await

File

.

ReadAllTextAsync

(

environmentRobotsTxt

);

}

// then robots.txt

else

if

(

File

.

Exists

(

generalRobotsTxt

))

{

output

=

await

File

.

ReadAllTextAsync

(

generalRobotsTxt

);

}

// then just a general default

else

{

output

=

Default

;

}

context

.

Response

.

ContentType

=

"text/plain"

;

await

context

.

Response

.

WriteAsync

(

output

);

}

else

{

await

next

(

context

);

}

}

}

Calling Robots.Txt In Startup.cs

Like any other middleware in an ASP.NET Core application, we need to register it in our middleware pipeline.

public

void

Configure

(

IApplicationBuilder

app

,

IWebHostEnvironment

env

)

{

if

(

env

.

IsDevelopment

())

{

app

.

UseDeveloperExceptionPage

();

}

else

{

app

.

UseExceptionHandler

(

"/Error"

);

app

.

UseHsts

();

}

app

.

UseHttpsRedirection

();

// Register Our Middleware

app

.

UseRobotsTxt

(

env

);

app

.

UseStaticFiles

();

app

.

UseRouting

();

app

.

UseAuthorization

();

app

.

UseEndpoints

(

endpoints

=>

{

endpoints

.

MapRazorPages

();

});

}

This particular middleware takes IWebHostEnvironment as a constructor parameter. Passing in the IWebHostEnvironment allows the middleware to read values like the environment name and if a root path is not provided at registration.

See also  [NEW] ประวัติกีฬาโอลิมปิก (opening ceremony london 2012) | กีฬาโอลิมปิกครั้งแรก - Nangdep.vn

Serving robots.txt

By navigating to /robots.txt we see the file based on our environment.

serving the https://d33wubrfki0l68.cloudfront.net/19881b5332448a7e288ec5df01c957770c886e89/f67b2/robots.txt

Hooray! We did it! By setting a breakpoint, we see we hit the middleware for the environment we expect.

middleware breakpoint

To download the project, go to my GitHub repository page. Note, you’ll need the .NET Core 3.0 SDK.

Conclusion

While the code may seem trivial, serving a correct robots.txt can have an enormous impact on the success of your site. I cannot recommend enough you think about who sees your content, including bots. It’s also important to know that most visitors find your site through a search, so in reality, your most important user is a bot.


Call of Duty: Black Ops lll – Hypocenter: ASP Repulser Robot Tank Fight XM-53 ML Gameplay Action


Support VGS https://www.patreon.com/VideoGamesSource
Follow VGS https://twitter.com/xOMGITSJASONx

นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูความรู้เพิ่มเติมที่นี่

Call of Duty: Black Ops lll - Hypocenter: ASP Repulser Robot Tank Fight XM-53 ML Gameplay Action

DT17 – NGHIÊN CỨU, TK CT ROBOT SONG SONG BỐN BẬC TỰ DO ĐK BẰNG RASPBERRY KẾT HỢP XLA TRONG DC SX


DT17 – NGHIÊN CỨU, THIẾT KẾ, CHẾ TẠO ROBOT SONG SONG BỐN BẬC TỰ DO ĐIỀU KHIỂN BẰNG RASPBERRY KẾT HỢP XỬ LÍ ẢNH ỨNG DỤNG TRONG DÂY CHUYỀN SẢN XUẤT
POSTER VÀ CLIP KẾT QUẢ ĐỒ ÁN TỐT NGHIỆP HỌC KỲ 2 2020 2021
SINH VIÊN KHOA CƠ KHÍ VÀ KHOA ĐÀO TẠO CHẤT LƯỢNG CAO
GIẢI THƯỞNG TỪ NHÀ TÀI TRỢ OneCAD Việt Nam:
PHẦN 1: GIẢI THƯỞNG DÀNH CHO PHẦN POSTER VÀ CLIP
GIẢI NHẤT: Trị giá đến 13.000.000 đồng
Một kỷ niệm chương
Giấy chứng nhận GIẢI NHẤT,
USB (cho mỗi thành viên)
Học bổng toàn phần khóa học Inventor SheetMetal và Surface Freeform cho mỗi thành viên
Tiền mặt: 5 triệu đồng.
GIẢI NHÌ: Trị giá đến 11.000.000 đồng
Một kỷ niệm chương
Giấy chứng nhận GIẢI NHÌ,
USB (cho mỗi thành viên)
Học bổng toàn phần khóa học Inventor SheetMetal cho mỗi thành viên
Tiền mặt: 3 triệu đồng.
GIẢI BA: Trị giá đến 9.000.000 đồng
Một kỷ niệm chương
Giấy chứng nhận GIẢI BA,
USB (cho mỗi thành viên)
Học bổng toàn phần khóa học Surface Freeform cho mỗi thành viên
Tiền mặt: 2 triệu đồng.
PHẦN 2: GIẢI THƯỞNG DÀNH CHO ĐỒ ÁN BẢO VỆ XUẤT SẮC NHẤT TRƯỚC HỘI ĐỒNG
Một kỷ niệm chương
Giấy chứng nhận ĐỒ ÁN BẢO VỆ XUẤT SẮC NHẤT TRƯỚC HĐBV
Một USB lưu niệm
HÌNH THỨC BÌNH CHỌN:
1. Share bài viết công khai trên LiveTV kèm theo caption: Chúc mừng các bạn OneCADVN.com [+5 điểm] SPKT CKM HCMUTE ĐATN
2. Bình luận vào bài viết mà bạn ủng hộ: Chúc mừng các bạn OneCADVN.com SPKT CKM HCMUTE ĐATN [+1 điểm]3. Bình luận vào website đăng bài chính thức tại FME.hcmute.edu.vn: Chúc mừng các bạn OneCADVN.com SPKT CKM HCMUTE ĐATN [+2 điểm]4. Số lượt view CLIP YOUTUBE của bài đăng trên website FME.hcmute.edu.vn [+3 điểm] bình luận cấu trúc ở mục (2) [+1 điểm]Tất cả các phần caption và bình luận đều phải đúng và đầu đủ cấu trúc, hastag
Không giới hạn số lượt share và bình luận để làm tăng view cho bài viết.
Nhà tài trợ và Khoa Cơ khí Chế tạo máy sẽ có giải pháp để tạo ra sân chơi công bằng cho tất cả các nhóm.
CHÚC TẤT CẢ CÁC BẠN MAY MẮN VÀ THÀNH CÔNG!

See also  [NEW] Geology and World Science | ขุดเจาะน้ํามัน - Nangdep.vn

DT17 – NGHIÊN CỨU, TK CT ROBOT SONG SONG BỐN BẬC TỰ DO ĐK BẰNG RASPBERRY KẾT HỢP XLA TRONG DC SX

Zig \u0026 Sharko 👎 BAD RANKING COMPILATION 👎 Cartoons for Children


Shark and Mermaid Cartoons for kids full episodes about BAD RANKING COMPILATION\r
\r
Zig e Sharko desenhos para criancas con o \r
MÁ COMPILAÇÃO DE RANKING\r
\r
Subscribe now to our channel for more cartoons : http://bit.ly/ZIGSHARKOtv\r
\r
To watch more Zig and Sharko episodes : http://bit.ly/ZS_VIDEO\r
\r
New episodes : http://bit.ly/zigs03compilation\r
Shark episodes : http://bit.ly/Zigbigsmile\r
Popular episodes : http://bit.ly/Zigrobot\r
Latest episodes : http://bit.ly/Zigcompilhair\r
\r
Check out the new Pencilmation Channel : http://bit.ly/PencilmationTV\r
\r
On a desert island lives a starving hyena with one obsession: devour that delicious mermaid from the rock in the lagoon. Ah, but the lovely fishgirl’s best friend is a shark, a shark with a lot of muscle and who loves to sabotage the hyena’s every move. In season 2, the mermaid decides to set up house on the beach. And she invites all her deepsea buddies to join her. But the stakes have been raised: now the hyena has to win back his own turf!\r
\r
cartoon funnycartoons animation cartoonsforkids selfie photo

Zig \u0026 Sharko 👎 BAD RANKING COMPILATION 👎 Cartoons for Children

ASP-ROBOT ลงทุนในนวัตกรรมแห่งอนาคต


Asset Plus x ลงทุนแมน
การใช้หุ่นยนต์ภาคอุตสาหกรรม กำลังเติบโต เพราะว่า หุ่นยนต์ และระบบอัตโนมัติ มีความแม่นยำ มีประสิทธิภาพ ราคาถูกลง และความปลอดภัยสูงกว่ามนุษย์ ท้ายที่สุดแล้วหุ่นยนต์จะมาทดแทนแรงงานมนุษย์
ซึ่งเราก็สามารถเป็นหนึ่งในเจ้าของ นวัตกรรมเหล่านี้ได้ ผ่านกองทุน ASPROBOT ซึ่งเป็นกองทุนแรกของไทย ที่เน้นลงทุนในธีมหุ่นยนต์และปัญญาประดิษฐ์ (AI)
สนใจผลิตภัณฑ์ศึกษาข้อมูลเพิ่มเติม ได้ที่ https://www.assetfund.co.th/adv/fund/ASPROBOT
ติดตามข้อมูลข่าวสารจาก บลจ.แอสเซท พลัส
Website : www.assetfund.co.th
Customer Care : 026721111
Fackbook : https://www.facebook.com/aspfund
YouTube : https://bit.ly/2Wh8N4N
Blockdit : https://bit.ly/38VxAjQ
Application ASP FUND : http://bit.ly/2MFVx6z
คำเตือน
ผู้ลงทุน “โปรดทำความเข้าใจลักษณะสินค้า เงื่อนไขผลตอบแทน และความเสี่ยงก่อนตัดสินใจลงทุน” เฉพาะส่วนที่มีการลงทุนในต่างประเทศป้องกันความเสี่ยงจากอัตราแลกเปลี่ยนไม่น้อยกว่าร้อยละ 90 ของมูลค่า เงินลงทุนในต่างประเทศทั้งนี้ในกรณีที่สภาวการณ์ไม่ปกติอาจพิจารณาป้องกันความเสี่ยงตามดุลยพินิจของผู้จัดการกองทุน ซึ่งผู้ลงทุนอาจขาดทุนหรือได้รับ กำไรจากอัตราแลกเปลี่ยน หรือได้รับเงินคืนต่ำกว่าเงินลงทุนเริ่มแรกได้

ASP-ROBOT ลงทุนในนวัตกรรมแห่งอนาคต

Zig \u0026 Sharko 🤮😵 2 KINDS OF POISON 🤮😵 2021 COMPILATION 💥 Cartoons for Children


Shark and Mermaid Cartoons for kids full episodes about 2 KINDS OF POISON
Zig e Sharko desenhos para criancas con o
2 ВИДА ЯДА
Subscribe now to our channel for more cartoons : http://bit.ly/ZIGSHARKOtv
To watch more Zig and Sharko episodes : http://bit.ly/ZS_VIDEO
New episodes : http://bit.ly/zigs03compilation
Shark episodes : http://bit.ly/Zigbigsmile
Popular episodes : http://bit.ly/Zigrobot
Latest episodes : http://bit.ly/Zigcompilhair
Check out the new Pencilmation Channel : http://bit.ly/PencilmationTV
On a desert island lives a starving hyena with one obsession: devour that delicious mermaid from the rock in the lagoon. Ah, but the lovely fishgirl’s best friend is a shark, a shark with a lot of muscle and who loves to sabotage the hyena’s every move. In season 2, the mermaid decides to set up house on the beach. And she invites all her deepsea buddies to join her. But the stakes have been raised: now the hyena has to win back his own turf!
cartoon funnycartoons animation cartoonsforkids selfie photo

Zig \u0026 Sharko 🤮😵 2 KINDS OF POISON 🤮😵 2021 COMPILATION 💥 Cartoons for Children

นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูบทความเพิ่มเติมในหมวดหมู่Wiki

ขอบคุณมากสำหรับการดูหัวข้อโพสต์ asp robot

Leave a Reply

Your email address will not be published. Required fields are marked *