Libcurl multiple requests The transfer is still set in an "easy" CURL * handle as described above , but with the multi interface you also need a multi CURLM * handle created and Feb 1, 2019 · The application needs to be enhanced to perform HTTPS requests, and I've decided to use libcurl. The libcurl interface. Request method Nov 11, 2011 · Is it possible to chain multiple proxies in a single request using cURL? For example: start cURL -> proxy1 -> proxy2 -> destination address Can this be achieved using cURL? Oct 23, 2024 · Asynchronous and concurrent requests are vital for modern applications, especially when dealing with multiple URLs. Nov 6, 2023 · Running curl commands sequentially may not cut it if you need hundreds or thousands of concurrent requests. Post by ricardo arraes » Tue Feb 09, 2021 1:42 pm. libcurl supports HTTP multiplexing for both HTTP/2 and HTTP/3. This handle supports a wide variety of options and can be used to make a single blocking request in a thread. It expects the entire POST body to be specified in a single call, as per documented in CURLOPT_POSTFIELDS explained : A collection of smaller stand-alone applications using the libcurl API in different ways to show how to use it for different Internet transfer scenarios. When reading this question, please bear in mind I have limited knowledge about HTTP-requests in general. libcurl also offers another interface that allows multiple simultaneous transfers in a single thread, the so called multi interface. However, a byte range is only a request to the server. Mar 6, 2025 · By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. The API currently closely matches that of libcurl itself, except that a Rustic layer of safety is applied on top. In this comprehensive guide, you will learn various methods to execute multiple curl requests in parallel to boost throughput, simulate loads, and gain performance insights. §The “Easy” API. Feb 10, 2015 · Multiplexing allows for reusing a single connection to one server for processing multiple HTTP requests. Download all examples . The fields required are: Looking at the example of a POST request found in libcurl's documentation, it seems that this line: Requests. I'm looking at optimizing these calls by converting them into asynchronous with multi_perform interface, Though I am having hard time understanding correct way to make use of it. Use the Content-Type header to specify the content you’re sending. Dec 1, 2022 · It cannot be used in multiple calls to curl_easy_setopt() to concatenate multiple pieces of data into a single POST body. All examples are written in C, unless specifically mentioned. Apr 9, 2020 · @TedLyngmo Thanks, I edited my original post with an example of my use. I have seen some examples of multi-interface setup and all the examples are accumulating the request and firing the multi perform. You can make libcurl ask for a range with CURLOPT Jun 16, 2021 · Note: I have been researching libcurl's multi-interface but I am struggling to determine if this interface is more suited to parallel requests to multiple URLs rather than sending requests to the same URL without having to wait for the function to finish executing each time. A libcurl-using application can tweak all those fields. More about that interface is detailed in a separate chapter further down. 8 seconds that show there is some problem. It does not have to respect the request and in many cases, like when the server automatically generates the contents on the fly when it is being asked, it simply refuses to do it and it then instead respond with the full contents anyway. The multi API is non-blocking so it can also make sense to use it for single transfers. Basically, let's say I have two (or more) threads, each thread makes a HTTP-request once per second. So, I am looking to use single easy interface handle for all requests. Oct 23, 2024 · Asynchronous and concurrent requests are vital for modern applications, especially when dealing with multiple URLs. Here is the log of server, the requests arrived every 10 seconds. With this model, I am getting issues in making multiple http requests. Sep 5, 2014 · I've never really done anything multithreaded or asynchronous in c++, I only used cURL to do single synchronous requests so far. The highest request time is 1. The easiest way to send a request is to use the Easy api which corresponds to CURL in libcurl. It seems that the client doesn't send the next request before geting the response of previous request. Feb 24, 2015 · I have a question regarding the safety of performing parallel HTTP-requests using libcurl (C++). Jan 16, 2020 · But due to timeouts and single threaded application, there's latency in running multiple operations. POST Requests with cURL. example. In order to better visualize what I'm trying to do, I wrote a simple The name 'multi' is for multiple, as in multiple parallel transfers, all done in the same single thread. Mar 8, 2012 · Here is a simplified example that does 100 curl requests total, 10 at a time (concurrently): seq 100 | parallel --max-args 0 --jobs 10 "curl https://www. An HTTP request contains a method, a path, HTTP version and a set of request headers. Hey everybody, I'm having a problem with libcurl and apache, I don't May 7, 2021 · However,I noticed that the server received the requests sequentially. . This method can improve the performance of request-heavy applications by eliminating the need to close and reopen server connections. With curl_easy_perform if I start 10 concurrent requests the total elapsed time not should be greater than highest request time. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features. Response is processed. I have tried the following and looked at these resources: Feb 23, 2021 · Currently using the C++ implementation of libcurl to interact with the Spotify API, looking for a way to pass multiple 'Request Body Parameters' during a POST request. se We do this to highlight the libcurl function calls and related options and reduce unrelated code. Feb 1, 2024 · In the above case, you are sending a GET request with an authorization header and a URL parameter for search. Nov 30, 2021 · Here you could see that I am returning responses individually for each request as soon as it is received. Feb 9, 2021 · Libcurl - multiple requests crashing Apache. An HTTP request is what curl sends to the server when it tells the server what to do. Upon a response being received the library calls back to my program using the function given to the CURLOPT_WRITEFUNCTION property via curl_easy_setopt . 2 seconds but the total elapsed time is 3. (All the requests made are to the same server). With POST requests, headers are used the same way, but data is sent via the --data or -d flag. To ask libcurl make a request using content encoding, use: curl_easy_setopt(curl, CURLOPT_ACCEPT_ENCODING, string); where string is the intended value of the Accept-Encoding header. You can also see a list of all libcurl easy options and which example source codes that use them. – Dec 5, 2015 · I need to make all requests in a single connection/session. But if I had one handle and use this handle for many requests in multiple threads that would probably solve the problem. But I want to perform exactly 10 requests/sec. I read that curl multi-interface is better in handling the parallel request. Make sure you do multiple transfers using the multi interface to a server that supports HTTP multiplexing. com" seq 100 generates a list of numbers that we pipe into parallel : See full list on curl. Hey everybody, I'm having a problem with libcurl and apache, I don't Apr 22, 2021 · Requests are some how performed in parallel. libcurl can only multiplex transfers when the same hostname is used for subsequent transfers. All transfers involving HTTP start with an HTTP request. Aside from the callback, I'm unclear on whether using the multi interface is exclusively for making multiple requests asynchronously, or if I can make a single request that is asynchronous with the rest of my program. A real-world application will of course properly check every return value and exit correctly at the first serious error. After some research, I see that the curl_easy_perform is a blocking call, so I've decided to use the curl_multi_perform approach for non-blocking calls to allow other work in the threads. The first request goes through using curl_multi_perform with no issue. You can leverage libcurl's multi interface to perform concurrent operations: CURLM *multi_handle = curl_multi_init(); // add easy handles to the multi handle and perform requests Jul 3, 2017 · Would that be possible? The problem is if I want for example 100 concurrent requests it opens too many connections and sometimes server refuses to answer because too many connections are already opened from the same IP. When it wants to get data or send data. To use multiplexing in libcurl, we need to configure it to use the HTTP/2 protocol. Jun 18, 2014 · The purpose of curl_multi_perform() is to let you do other things while curl is busy, without having to use threads. You can leverage libcurl's multi interface to perform concurrent operations: CURLM *multi_handle = curl_multi_init(); // add easy handles to the multi handle and perform requests Oct 16, 2012 · I'm using libcurl to send HTTP post requests and subsequently process the responses. If you use a thread, you may as well use curl_easy_perform() instead. rval rkqmk aonx yccx bhmsv qeex fnozr ukvh pbyreyx ptac tpmkr pheydzd jeafpns fgdv wqiaeokqv