Add Client methods with both content provider and receiver

[clarkok]

Add most Post overloads for Client, with both content provider and content receiver.

• Result Post(const std::string &path, size_t content_length, ContentProvider content_provider, const std::string &content_type, ContentReceiver content_receiver, UploadProgress progress = nullptr)
• Result Post(const std::string &path, ContentProviderWithoutLength content_provider, const std::string &content_type, ContentReceiver content_receiver, UploadProgress progress = nullptr)
• Result Post(const std::string &path, const Headers &headers, size_t content_length, ContentProvider content_provider, const std::string &content_type, ContentReceiver content_receiver, DownloadProgress progress = nullptr)
• Result Post(const std::string &path, const Headers &headers, ContentProviderWithoutLength content_provider, const std::string &content_type, ContentReceiver content_receiver, DownloadProgress progress = nullptr)

[yhirose]

@clarkok thanks for the pull request. But I am not going to approve it since it create another two POST specific implementations. Could you please rename send_with_content_provider to send_with_content_provider_and_receiver, and add your receiver support to it? Also could you add the same methods to PUT and PATCH for consistency? Then, I'll start review your pull request. Thanks!

[clarkok]

Thanks @yhirose . I've done the changes you mentioned. Would you mind taking a look?

[yhirose]

Could you explain why these lines need to be added? These are already added at line 3842 and 3843.

[clarkok]

Sorry I was not planning to take this change in the PR, I'm not very familar with how PR works in Github.

However this is a separated issue I found during my Android project. In short, this doesn't work, the node on the right side of the assignment is actually referring to the member of GetAddrInforState which is empty, instead of the function parameter. Thus the getaddrinfo below always return EAI_SERVICE as both node and service are empty, and probably hints are not in expected state.

I've written a short piece of repro code in the below link for your reference.

https://godbolt.org/z/9sW9EjjYK

I'll revert this back and create a new PR for the issue.

[yhirose]

Thanks for the explanation!

[clarkok]

NP, BTW after this fix the library is working on Android flawlessly

[yhirose]

@clarkok Thanks for the excellent contribution!