Curl windows server 2008

Информация о cURL 7.19.0

Скачать cURL 7.19.0

This is continuation to issues found in 2013 and 2015:

https://sourceforge.net/p/curl/bugs/1275/
https://curl.haxx.se/mail/lib-2015-05/0063.html

Issue 1. This is main problem — as described in links above. Pinpointed that it is caused when all of these are true:

• Uploading file in 4MB POST/PUT reguests to service deployed in Windows Server 2008/IIS 7.5
• Reusing CURL handles (either with curl_easy_reset() or using CURLM)
• Using CURLOPT_POSTFIELDSIZE/CURLOPT_POSTFIELDSIZE_LARGE with CURLOPT_POSTFIELDS
  or using CURLOPT_INFILESIZE/CURLOPT_INFILESIZE_LARGE with CURLOPT_READFUNCTION.

Result (reproduceable 100%):

1. Request 1 uploads 4MB
2. Request 2 uploads 3.45MB (+- 100K) and stucks
3. Read function is no longer called.
4. CURL timeout happens.
5. Request hangs for some time on server side and keeps file locked.

3 workarounds that I know that work:

1. Do not use curl_easy_reset(), use curl_easy_init()
2. Do not use CURLM for uploads
3. Use plain CURLOPT_POSTFIELDS without setting request size manually. However, this does not work for binary uploads as it cannot calculate correct length.

We chose workarounds 1 (2013) and 2 (2015).

Issue 2. Side problem that we found recently with new servers and above workarounds:

• Uploading file in 4MB POST/PUT requests to service deployed in Windows Server 2012/IIS 8.0
• NOT reusing CURL handles and using curl_easy_init() for each request.

Result (varying results, same outcome when fails):

1. Upload fails after 100-900MBs, succeeds in rare cases for 1GB file.
2. CURL fails with:
   «Unknown SSL protocol error in connection to myHostName:443. SSL connect error(CURLE_SSL_CONNECT_ERROR)»

Workaround that I know:

1. Use curl_easy_reset() or CURLM.

So now I’m stuck, fixing issue 2 enables issue 1 and vice versa.

I would preffer fixing issue 1 because using CURLM is far more flexible approach. I currently have plain CURL C++ source code talking to specific server if that would help, but no server to test it on. I will try to get public server deployed for reproducing issue 1 but not sure when that could be.

Any ideas so far how to solve hanging upload?
Why would using plain CURLOPT_POSTFIELDS fix issue 1?

libCURL:7.50.3
OpenSSL:1.0.2j
Client OS: iOS/Windows x64

Curl stands for Client URL is a popular command-line tool used for transferring data from various sources using URL syntax. It supports a wide range of protocols like HTTP, HTTPS, and FTP making it a versatile tool for developers and system administrators. It is also used for transferring data using various network protocols. It is a powerful utility for developers to test APIs, upload or download files, and more.

Install Curl Windows is a straightforward process and in the following article, we will cover how to do so.

Prerequisites

Before proceeding with the installation of Curl on Windows ensure the following prerequisites:

• Windows 7 or later.
• Administrative privileges to execute the installation.

Installing the Curl command on Windows

Following are the methods for installing the Curl command in Windows older or later versions:

Method 1: Manual Installation

Download the Curl executable file by navigating to the official Curl download page. Download the appropriate version for your system and look for Win64 or Win32 zip files.

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Once downloaded, extract the ZIP file to your preferred location for example C:\Curl location.

Add Curl to Windows PATH

This step allows you to run curl commands from any directory in your command prompt.

• Search for System Properties in the Start menu.
• In the System Properties window, click on Environment Variables.
• Under System Variables, find and select the Path variable, then click on Edit.

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• Click on New and add the path to your Curl installation for example C:\Curl\bin.

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Click OK to close each window. Now verify the installation by typing the following command in your Windows Command Prompt.

curl --version

If installed correctly, it should display the version number.

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Method 2: Using the Windows 10/11 Command Line

Windows 10 and later comes with Curl pre-installed. To check if Curl is already installed on your system:

1. Open the Start menu.
2. Type cmd and open Command Prompt.
3. In the Command Prompt window, type curl --version and press Enter.
4. If Curl is installed, it will display the version number.

Method 3: Using a Chocolatey Package Manager

If you prefer using a package manager on Windows like Chocolatey then open Command Prompt as administrator. Paste the following command and execute it:

Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))

Wait for Chocolatey to install. In the same Command Prompt window, type the following:

choco install curl

Chocolatey will download and install Curl. After installation completes verify that in Command Prompt to check if it’s installed correctly.

Using Curl Command

Curl Windows cmd offers a vast array of options and functionalities. Here’s a basic example to get you started:

curl https://www.example.com

This command retrieves the content of the website and displays it in your command prompt window.

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You can also download a file from a URL with the help of the Curl command:

curl https://example.com/file.txt -o filename.txt

This retrieves the file file.txt from https://example.com and saves it locally as filename.txt. Downloading silently without a progress meter.

curl -s https://example.com/file.txt -o filename.txt

Conclusion

Whether through manual downloading or using Chocolatey installing Curl on Windows is simple and enhances your ability to interact with web services right from your command line. Remember to always download software from official sources or trusted package managers to ensure security.

FAQ

Edit me

Хотя Postman удобен, его трудно использовать для представления в документации, как совершать запросы с его помощью. Кроме того, разные пользователи, вероятно, используют разные клиенты с графическим интерфейсом или вообще не используют их (предпочитая командную строку)

Вместо того, чтобы описывать, как выполнять REST-запросы с использованием GUI-клиента, такого как Postman, наиболее традиционный метод документирования синтаксиса запроса — использовать curl.

curl — это утилита командной строки, которая позволяет выполнять HTTP-запросы с различными параметрами и методами. Вместо того, чтобы переходить к веб-ресурсам в адресной строке браузера, можно использовать командную строку, чтобы получить те же ресурсы, извлеченные в виде текста.

Установка curl

curl доступен на MacOS по умолчанию, для Windows требуется установка. Ниже представлены инструкции по установке curl.

Установка на MacOS

Проверить установлен ли curl на MacOS можно так:

1. Открываем Терминал (нажимаем Cmd+spacebar для открытия Спотлайт и вводим Terminal).
2. В терминале пишем curl -V. Ответ должен быть примерно таким:

curl 7.54.0 (x86_64-apple-darwin16.0) libcurl/7.54.0 SecureTransport zlib/1.2.8
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smb smbs smtp smtps telnet tftp Features: AsynchDNS IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz UnixSockets

Если такого ответа нет, то curl необходимо скачать и установить

Установка на Windows

Установка curl в Windows включает другие шаги. Сначала определяем версию windows: 32-разрядная или 64-разрядная версия Windows, щелкнув правой кнопкой мыши Компьютер и выбрав Свойства. Затем следуем инструкциям на этой странице. Нужно выбрать одну из бесплатных версий с правами Администратора.

После установки проверяем версию установленной curl;

1. Открываем командную строку нажав кнопку Пуск и введя cmd
2. В строке пишем curl -V

Ответ должен быть примерно таким:

curl 7.54.0 (x86_64-apple-darwin14.0) libcurl/7.37.1 SecureTransport zlib/1.2.5
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: AsynchDNS GSS-Negotiate IPv6 Largefile NTLM NTLM_WB SSL libz

Создание тестового вызова API

После установки curl делаем тестовый вызов API

curl -X GET "https://api.openweathermap.org/data/2.5/weather?zip=95050&appid=fd4698c940c6d1da602a70ac34f0b147&units=imperial"

В ответ должен вернуться минимизированный JSON:

{"coord":{"lon":-121.96,"lat":37.35},"weather":[{"id":701,"main":"Mist","description":"mist","icon":"50d"}],"base":"stations","main":{"temp":66.92,"pressure":1017,"humidity":50,"temp_min":53.6,"temp_max":75.2},"visibility":16093,"wind":{"speed":10.29,"deg":300},"clouds":{"all":75},"dt":1522526400,"sys":{"type":1,"id":479,"message":0.0051,"country":"US","sunrise":1522504404,"sunset":1522549829},"id":420006397,"name":"Santa Clara","cod":200}

curl и Windows

Если вы используете Windows, обратите внимание на следующие требования к форматированию при использовании curl:

• Используйте двойные кавычки в командной строке Windows. (Windows не поддерживает одинарные кавычки.);
• Не используйте обратную косую черту \ для разделения строк. (Это только для удобства чтения и не влияет на вызов на Mac.)
• Добавив -k в команду curl, вы можете обойти сертификат безопасности curl, который может быть необходимым.

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