如何在HTTP请求中发送缓冲区？ [英] How do I send a buffer in an HTTP request?

问题描述

我在内存中有一个文件（缓冲区） - 文件系统上没有文件。
我想将该缓冲区发送到另一个谈论HTTP的服务器。

I have a file in memory (buffer) - there is no file on the file system. I want to send that buffer to another server that talks HTTP.

例如，某些API A 在内存中创建一个文件， SignServer 操纵此类文件，并使用新缓冲区进行响应。我的API从 A 获取文件并将其提供给SignServer。

For example, some API A creates a file in memory, SignServer manipulates such files, and responds with a new buffer. My API takes the file from A and feeds it to SignServer.

我尝试以多种方式将文件发送到SignServer，但它仍然响应状态为400（请求中缺少字段'data'）。

I tried sending the file to SignServer in multiple ways, but it keeps responding with status 400 (missing field 'data' in request).

我尝试了什么：

var http = require('http');
var querystring = require('querystring');

var data = querystring.stringify({
    workerName: 'PDFSigner',
    data: file_buffer
});

var request = new http.ClientRequest({
    hostname: 'localhost',
    port: 8080,
    path: '/signserver/process',
    method: 'GET',
    headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        // I also tried 'multipart/form-data'
        'Content-Length': Buffer.byteLength(data)
    }
});

request.end(data);

我尝试打印数据，它显示：

workerName = PDFSigner& data =

workerName=PDFSigner&data=

哪个不好，因为 data 未设置为 file_buffer 。
我试过打印 file_buffer ，它确实有内容（不是null，不是未定义，实际上有里面的字节）。
因此字符串化缓冲区给出了一个空字符串。

Which is bad because data wasn't set to file_buffer. I tried printing file_buffer, and it does have content (not null, not undefined, actually has bytes inside). So stringifying the buffer gave an empty string.

我尝试用 request 模块，它也不起作用。

I tried doing the same thing with the request module and it didn't work either.

请注意，SignServer不是在Node中编写的也不是JavaScript。它是一个Java应用程序，因此它可能不适用于json（这就是为什么我要尝试使用 querystring ）。是的，我尝试发送json。

Note that SignServer isn't written in Node nor JavaScript. It's a Java application, so it probably doesn't work with json (which is why I'm trying to do it with querystring). Yes, I tried sending json.

推荐答案

数据的原因是设置为空字符串在此问题和解决方案在此问题中给出。

The reason why data is set to an empty string is described in this issue and the solution is given in this issue.

转义并对缓冲区进行字符串化，如下所示：

escape and stringify the buffer like so:

var data = querystring.stringify({
    workerName: 'PDFSigner',
    data: escape(file_buffer).toString('binary')
});

正如@robertklep所提到的，你的另一个问题是你无法使用<$发送一个大文件C $ C>应用程序/ x-WWW窗体-urlencoded 。你需要用 multipart / form-data 来做。

As @robertklep mentioned, your other problem is that you can't send a big file using application/x-www-form-urlencoded. You'd need to do it with multipart/form-data.

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