RCurl getForm传递http标头 [英] RCurl getForm pass http headers

问题描述

使用RCurl的 getForm 函数，这是传递GET参数的唯一好方法，我需要修改一些http头。在getURI中，你只需传递 httpheader = c（Whatever ='whatever'，...）就可以了。不幸的是，这个参数似乎被 getForm 忽略。

Using RCurl's getForm function, which is the only nice way of passing in GET-parameters, I need to alter some http headers. In getURI, you just pass httpheader = c(Whatever='whatever',...) and it'll work. Unfortunately, that argument seems to be ignored by getForm.

如何在getForm请求中设置http标头？

How do I set the http headers in a getForm request?

推荐答案

p>欢迎来到 RCurl 的混乱世界！你发现它的语法没有意义，这不是你的错。

Welcome to the confusing world of RCurl! You've discovered that its syntax makes no sense, which is not your fault.

在 getForm 作为第二个参数（ ... ）。请参阅的 usage 部分？ getForm ：

In getForm you pass headers as the second argument (the ...). See the usage section of ? getForm:

getForm(uri, ..., .params = character(), .opts = list(), curl = getCurlHandle(),
         .encoding = integer(), binary = NA, .checkParams = TRUE)

参数部分说：

值对参数。注意，这些不是CURL选项。

... the name-value pairs of parameters. Note that these are not the CURL options.

相比之下，另一个主力函数 getURL 说：

By contrast, the other workhorse function getURL says:

getURL(url, ..., .opts = list(),
        write = basicTextGatherer(.mapUnicode = .mapUnicode),
         curl = getCurlHandle(), async = length(url) > 1,
           .encoding = integer(), .mapUnicode = TRUE)

...被解释为控制HTTP请求的CURL选项的命名值。

... named values that are interpreted as CURL options governing the HTTP request.

因此，当使用 getForm 时，您只需将标题作为列表传递，当使用 getURL 时，您需要在 httpheader 参数中指定它们。

Thus, when using getForm, you can just pass the headers as a list, but when using getURL, you need to specify them in a httpheader argument.

因此我的一般建议是总是使用 curlPerform ，而不是任何封装函数（如 getForm 或 getURL ），因为那样你将始终使用一致的语法。

My general advice is therefore to always use curlPerform instead of any of the wrapper functions (like getForm or getURL), because then you'll always be using a consistent syntax.

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