Curl proxy authentication windows

Curl proxy authentication windows

For those that know how to use it, cURL is a powerful tool. Come in now to learn how to route your cURL requests through proxies. Are you a fan of using cURL? What if I tell you that you can access and transfer data unanimously, with your real IP Address masked using these proxies?

If you are interested in learning how to get that done, then this article has been written for you. It is no longer news that Curl, despite its popularity among developers that many of its users do not know how to get it to work with proxies. This is not unconnected to the fact that information on how to get this done is not as common as it should be. It is also related to the fact that the popularity of cURL is reducing gradually as other means of accessing data over a network are being used.

The cURL library is a command-line utility tool for transferring data using various network protocols. The word is an acronym for Client URL.

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If this explanation sounds difficult to comprehend, just look at it as a library that allows you to fetch data over the Internet.

Some developers use it to access API points. The tool was developed initially for pulling forex rates for IRC users. When it was first released, it was known as urlget. The name later changed to httpget before the current name was adopted. The tool was developed by Daniel Stenberg, a Swedish developer. The tool has support for a good number of network protocols. It is portable and works on a good number of platforms, including Microsoft Windows, Solaris, macOS, Android, iOS, and a host of over 10 other operating systems.

Setting proxies to work with cURL is actually easy.

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All you need to do is make use of it. The variable you use depends on the type of authentication you want to use. Many proxy service providers allow their users to authenticate by whitelisting their device real IP Addresses with the proxies they intend to use. With this setting in place, there is no need to make use of username and password for authentication again.

This method is the simplest in terms of cURL syntax. The command to use is the -x command or -proxy command. The full command is written below.A proxy in a network context is a sort of middle man, a server in between you as a client and the remote server you want to communicate with. The client contacts the middle man which then goes on to contact the remote server for you. This sort of proxy use is sometimes used by companies and organizations, in which case you are usually required to use them to reach the target server.

There are several different kinds of proxies and different protocols to use when communicating with a proxy, and libcurl supports a few of the most common proxy protocols. It is important to realize that the protocol used to the proxy is not necessarily the same protocol used to the remote server. When setting up a transfer with libcurl you need to point out the server name and port number of the proxy.

You may find that your favorite browsers can do this in slightly more advanced ways than libcurl can, and we will get into such details in later sections. In a section above you can see that different proxy setups allow the name resolving to be done by different parties involved in the transfer.

You can in several cases either have the client resolve the server host name and pass on the IP address to the proxy to connect to - which of course assumes that the name lookup works accurately on the client system - or you can hand over the name to the proxy to have the proxy resolve the name; converting it to an IP address to connect to. If your network connection requires the use of a proxy to reach the destination, you must figure this out and tell libcurl to use the correct proxy.

There is no support in libcurl to make it automatically figure out or detect a proxy. When using a browser, it is popular to provide the proxy with a PAC script or other means but none of those are recognized by libcurl. If no proxy option has been set, libcurl will check for the existence of specially named environment variables before it performs its transfer to see if a proxy is requested to get used.

Like this:. If a specific protocol variable one exists, such a one will take precedence. When using environment variables to set a proxy, you could easily end up in a situation where one or a few host names should be excluded from going through the proxy.

Set that to a comma- separated list of host names that should not use a proxy when being accessed. Instead of sending the request to the actual remote server, the client libcurl instead asks the proxy for the specific resource. Such a request opens a tunnel through the proxy, where it basically just passes data through without understanding it.

Many HTTP proxies are setup to inhibit connections to other port numbers than 80 and Since the proxy connection is separate from the connection to the remote site even in this situation, as HTTPS to the remote site will be tunnelled through the HTTPS connection to the proxy, libcurl provies a whole set of TLS options for the proxy connection that are separate from the connection to the remote host.

HTTPS proxies are still today fairly unusual in organizations and companies. Everything curl. How to read this book. The cURL project. Get curl. Open Source. The source code. Network and protocols. Command line basics. Using curl. How to HTTP with curl. Easy handle. Drive transfers. Connection reuse. Name resolving.Recently I came accross the issue of wanting to install apt packages in WSL behind a corporate proxy.

The solution is the same as if we want to set the proxy in a standard Ubuntu. So simply create a proxy. Aditionally we need to set the proxy for curl. Learn how your comment data is processed. I recently worked on a project where we needed to create a fully self configuring mounted wall display solution that could be zero touch deployed across the company.

You can read more about the full Read more…. The reason for it is that Microsoft is wating for hardware vendors to certify their hardware for Windows Server However if you are like me Read more…. When working with SQL data and lots of foreign keys, you may have the need to drop everything.


Well I have just the right SQL statement for you. The following statement will drop everything the Read more…. December You are now using apt and curl through your corporate proxy. Like this: Like Loading Categories: Programming System Administration. Tags: linux vscode wsl. Leave a Reply Cancel reply. Related Posts. System Administration How-To: Configure Google Chrome Extensions with Windows GPO I recently worked on a project where we needed to create a fully self configuring mounted wall display solution that could be zero touch deployed across the company.Some HTTP servers and proxies require authentication before allowing access to resources on the Internet.


If authentication is required, the HTTP application receives a status code of server requires authentication or proxy requires authentication.

Along with the status code, the proxy or server sends one or more authenticate headers: WWW-Authenticate for server authentication or Proxy-Authenticate for proxy authentication. Each authenticate header contains a supported authentication scheme and, for the Basic and Digest schemes, a realm. If multiple authentication schemes are supported, the server returns multiple authenticate headers.

The realm value is case-sensitive and defines a set of servers or proxies for which the same credentials are accepted. This header specifies that user credentials must be supplied for the "example" domain. An HTTP application can include an authorization header field with a request it sends to the server.

The authorization header contains the authentication scheme and the appropriate response required by that scheme. Although they are shown here as plain text, the username and password are actually base64 encoded. Basic authentication scheme, in which the user name and password are sent in clear text to the server.

curl proxy authentication windows

The Basic authentication scheme is based on the model that a client must identify itself with a user name and password for each realm. The server services the request only if the request is sent with an authorization header that includes a valid user name and password. Challenge-response schemes, such as Kerberos, in which the server challenges the client with authentication data.

The client transforms the data with the user credentials and sends the transformed data back to the server for authentication.

Challenge-response schemes enable a more secure authentication. In a challenge-response scheme, the username and password are never transmitted over the network. After the client selects a challenge-response scheme, the server returns an appropriate status code with a challenge that contains the authentication data for that scheme. The client then resends the request with the proper response to obtain the requested service. Challenge-response schemes can take multiple exchanges to complete.

The following table contains the authentication schemes that are supported by WinHTTP, the authentication type, and a description of the scheme.

When a response is received with a or status code, WinHttpQueryAuthSchemes can be used to parse the authentication headers to determine the supported authentication schemes and the authentication target. The authentication target is the server or proxy that requests authentication. WinHttpQueryAuthSchemes also determines the first authentication scheme, from the available schemes, based on the authentication scheme preferences suggested by the server.

This method for choosing an authentication scheme is the behavior suggested by RFC WinHttpSetCredentials enables an application to specify the authentication scheme that is used along with a valid username and password for use on the target server or proxy. After setting the credentials and resending the request, the necessary headers are generated and added to the request automatically. When this error is encountered, the application should continue to resend the request until a response is received that does not contain a or status code.

A status code indicates that the resource is available and the request is successful. If an acceptable authentication scheme and credentials are known before a request is sent to the server, an application can call WinHttpSetCredentials before calling WinHttpSendRequest.

In this case, WinHTTP attempts pre-authentication with the server by providing credentials or authentication data in the initial request to the server. Pre-authentication can decrease the number of exchanges in the authentication process and therefore improve application performance.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. This problem occurred if curl compiled with --with-gssapi option.

And when we begin install Linux the problems begin. Many programs use the curl, but to tell them that they must use --proxy-ntlm option is impossible. Maximum that I can tell to them is proxy address, user name and password.

I like do it system-wide.

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We want that Linux workstation can work in Windows network. Able update via package manager yum, dnf, aptitude, etc download files via wget, send bug reports via gnome-abrt, and of course expected if it was a server all server software php, python etc able work via curl SOAP with external services of course without rewriting this software.

Ok, why needed this mode. Able update via package manager yum, dnf, aptitude, etc download files via wget, send bug reports via gnome-abrt, and of course expected if it was a server all server software php, python atc able work via curl SOAP with external services of course without rewriting this software. Thank you for providing the background info.

Curl Proxy Settings – How to cURL with a proxy?

Could this be resolved by configuring the proxy such that it does not advertise Kerberos? You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: comment. Unfortunately we can not affect admins which tuning the proxy server.

If we could we already agreed about opening required ports to the Internet. We have already found a workaround this is cntlm proxy which installed on our side and pass all queries to NTLM proxy. But I would like that curl can do it directly.

Linux should to be more friendlier and more comfortable this only way breaks through the way to desktop. Main problem is installation this package, because package managers couldn't work they use of course curl, but curl by default not work with NTLMalso not work wget. That should of course be enough clues for libcurl to decide that it should rather try another allowed authentication mechanism Please see a possible fix for HTTP works for me : iboukris b Hmm, I think this patch assumes Negotiate header is the first header.

Perhaps we need another approach. I've pushed a fix that I think addresses for the most part which was built off some work I was doing back in March that I have recently pushed - However in this fix I have assumed we should let GSS-API based empty user names through as the user will be coming from the credientals cache.

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I don't recall exactly, but I think it may just be a precaution for the next request using the same easy handle? Any updates here? There are a few open issues on this topic.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account.

This causes the APT process post the initial extraction of the subsystem to hang and thus the apt process must be killed to allow you to configure the username etc. As it is not in place there is no way to populate the apt.

FYI : adding the configuration post user configuration an populating the proxy information apt work as desired, but the original issue obviously is still present.

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For future posts, please use the format in contributing. Regarding this post, what browser proxy settings are you looking to extend to the bash shell, during installation? Yes, facing the same problem and unable to set the proxy on the shell and henceforth unable to use apt commands.

Also apt. It would be great if we could extend the system proxy or from a browser ex: Chrome, Firefox or IE to the bash shell. The linuxsubsystem is downloaded from the Store, extracted then hangs as the APT process is attempting to do something in the background.

Plus apt. Microsoft Windows [Version Try sudo nano apt. Be warned however if your proxy needs authentication you will need to place your username and the password for said authentication in the apt. I had this issue too, and it was worse than just not being able to run behind the proxy, but that I couldn't even install the distribution at all.

I only happened to try this again while at home and found that it did work at that time. I wouldn't have been able to follow the suggestion on changing the apt.

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Check if either are blocked. Hello JasonLinMS. It appears that without that set, my bash won't work for anything. For me, I have to have both the APT settings configured in apt. Generally speaking, they do. The exception I've encountered is apps that were cross-compiled from Linux, but over time, I've seen that less and less as toolsets seem to add that hook or functionality in later versions.

That said, I tend to spend a lot of my time looking for proxy configs when I see things not working immediately.

curl proxy authentication windows

For my case, the biggest issue is just not being able to run the installer at all to get started without having to be outside of a proxy. I could probably get some kind of exception rule added with our security group's help, but I would need to know what to request ahead of time. Or if the tarball is downloaded and extracted, but the next step running apt fails to run.

curl proxy authentication windows

It should be easy to tell based on the messages in bash. JasonLinMS. Thanks, for the failure to run the installer, do you know if the installer tarball is failing to download? Look at barryb20 response above sunilmut The proxy configuration for the APT process to access the Ubuntu servers during initial setup. JasonLinMS - I don't believe the installer tarball is failing to download, but what I see is the following:.

I think it's more that APT attempts to do some post-install configuration before you can get anywhere, and that is hanging up. Thanks JasonLinMS we will download and test.You can use cUrl on Windows 10, and older versions.

If you want to use cUrl on Windows 10, you have two options. Check your Windows 10 build and if you have anything older thanproceed as follows. You will have to download cUrl from the official website. The Windows version is at the bottom of the download page. You want to download the generic zipped version.


Extract the zipped file and inside the bin folder, you will find the curl. Open Command Prompt in this folder, and run whatever command it is you want. This will allow you to run cUrl from anywhere. If your Windows 10 build isor later, cUrl is included by default.

curl proxy authentication windows

All you need to do is run Command Prompt with administrative rights and you can use cUrl. The Curl. If you want to be able to use cUrl from anywhere, consider adding it to Path Environment Variables. You need to download cUrl from official website linked in the previous section, and run it. To make it easier to use, you can add it to Path Environment Variables. Microsoft gives users plenty of reason to upgrade to Windows Tar lets you create archives, and extract them without needing additional tools.

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