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Editorial Team
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Asked: 2026-06-04T15:38:41+00:00

I got some images to download using HTTP. I got these images’ URL, how

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I got some images to download using HTTP. I got these images’ URL, how to build the TCP-based HTTP buffer to download the image?

I got no library in my current platform, the only supported language in this platform is C, so I have to build the HTTP buffer for these resources.

Currently I have build the normal API request, they are all HTTP request, every request have 0 or more parameters. But the image request got only a URL, such as http://some-image.jpg, it seems just a download job, no API parameters, no authorization, it’s simple, but how to construct the TCP request?

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1 Answer

  1. Editorial Team

    According to the http://www.jmarshall.com/easy/http/#sample, I build my TCP request like that:

    sprintf(tcp_send_buf, "GET %s HTTP/1.1\r\nHost: %s\r\n\r\n", img_path, img_host);

/* I wrapped TCP APIs for convenient, hope you understand it... */
set_host_and_port(img_host, 80);
tcp_send(tcp_send_buf, strlen(tcp_send_buf), recv_callback);

    On my recv_callback, I got the server response like that:

    HTTP/1.1 200 OK
Content-Length: 42299
Content-Type: image/jpeg
Last-Modified: Mon, 02 Jul 2007 07:58:47 GMT
Accept-Ranges: bytes
ETag: "e2c8b5d17ebcc71:15d5"
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Date: Fri, 25 May 2012 01:33:57 GMT

<binary image data>

    I downloaded the image from Chrome, and it’s size is the same as Content-Length: 42299, I think I got the image buffer.

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