Qianfan Models support http proxy setting(#951) (#1159)

## Issue
https://github.com/langchain4j/langchain4j/issues/951


## Change
- ```QianfanChatModel``` support proxy now
- ```QianfanEmbeddingModel``` support proxy now
- ```QianfanLanguageModel``` support proxy now
- ```QianfanStreamingChatModel``` support proxy now


## General checklist
<!-- Please double-check the following points and mark them like this:
[X] -->
- [X] There are no breaking changes
- [ ] I have added unit and integration tests for my change
- [X] I have manually run all the unit and integration tests in the
module I have added/changed, and they are all green
- [ ] I have manually run all the unit and integration tests in the
[core](https://github.com/langchain4j/langchain4j/tree/main/langchain4j-core)
and
[main](https://github.com/langchain4j/langchain4j/tree/main/langchain4j)
modules, and they are all green
<!-- Before adding documentation and example(s) (below), please wait
until the PR is reviewed and approved. -->
- [ ] I have added/updated the
[documentation](https://github.com/langchain4j/langchain4j/tree/main/docs/docs)
- [ ] I have added an example in the [examples
repo](https://github.com/langchain4j/langchain4j-examples) (only for
"big" features)


## Checklist for adding new model integration
<!-- Please double-check the following points and mark them like this:
[X] -->
- [ ] I have added my new module in the
[BOM](https://github.com/langchain4j/langchain4j/blob/main/langchain4j-bom/pom.xml)


## Checklist for adding new embedding store integration
<!-- Please double-check the following points and mark them like this:
[X] -->
- [ ] I have added a `{NameOfIntegration}EmbeddingStoreIT` that extends
from either `EmbeddingStoreIT` or `EmbeddingStoreWithFilteringIT`
- [ ] I have added my new module in the
[BOM](https://github.com/langchain4j/langchain4j/blob/main/langchain4j-bom/pom.xml)


## Checklist for changing existing embedding store integration
<!-- Please double-check the following points and mark them like this:
[X] -->
- [ ] I have manually verified that the
`{NameOfIntegration}EmbeddingStore` works correctly with the data
persisted using the latest released version of LangChain4j

Co-authored-by: jianye.zheng <jianye.zheng@xuncetech.com>

langchain4j-qianfan/src/main/java/dev/langchain4j/model/qianfan/QianfanChatModel.java

@@ -2,22 +2,25 @@ package dev.langchain4j.model.qianfan;
 
 
 import dev.langchain4j.agent.tool.ToolSpecification;
-import dev.langchain4j.data.message.*;
+import dev.langchain4j.data.message.AiMessage;
+import dev.langchain4j.data.message.ChatMessage;
 import dev.langchain4j.internal.Utils;
 import dev.langchain4j.model.chat.ChatLanguageModel;
 import dev.langchain4j.model.output.Response;
 import dev.langchain4j.model.qianfan.client.QianfanClient;
+import dev.langchain4j.model.qianfan.client.chat.ChatCompletionRequest;
 import dev.langchain4j.model.qianfan.client.chat.ChatCompletionResponse;
 import dev.langchain4j.model.qianfan.spi.QianfanChatModelBuilderFactory;
 import lombok.Builder;
+
+import java.net.Proxy;
 import java.util.List;
+
 import static dev.langchain4j.internal.RetryUtils.withRetry;
 import static dev.langchain4j.internal.Utils.getOrDefault;
 import static dev.langchain4j.model.qianfan.InternalQianfanHelper.*;
 import static dev.langchain4j.spi.ServiceHelper.loadFactories;
 
-import dev.langchain4j.model.qianfan.client.chat.ChatCompletionRequest;
-
 /**
  *
  * see details here: https://cloud.baidu.com/doc/WENXINWORKSHOP/s/Nlks5zkzu
@@ -54,7 +57,8 @@ public class QianfanChatModel implements ChatLanguageModel {
                             String responseFormat,
                             Double penaltyScore,
                             Boolean logRequests,
-                            Boolean logResponses
+                            Boolean logResponses,
+                            Proxy proxy
                              ) {
         if (Utils.isNullOrBlank(apiKey)||Utils.isNullOrBlank(secretKey)) {
             throw new IllegalArgumentException(" api key and secret key must be defined. It can be generated here: https://console.bce.baidu.com/qianfan/ais/console/applicationConsole/application");
@@ -75,6 +79,7 @@ public class QianfanChatModel implements ChatLanguageModel {
                 .secretKey(secretKey)
                 .logRequests(logRequests)
                 .logResponses(logResponses)
+                .proxy(proxy)
                 .build();
         this.temperature = getOrDefault(temperature, 0.7);
         this.maxRetries = getOrDefault(maxRetries, 3);

langchain4j-qianfan/src/main/java/dev/langchain4j/model/qianfan/QianfanEmbeddingModel.java

@@ -6,14 +6,17 @@ import dev.langchain4j.internal.Utils;
 import dev.langchain4j.model.embedding.EmbeddingModel;
 import dev.langchain4j.model.output.Response;
 import dev.langchain4j.model.qianfan.client.QianfanClient;
-import dev.langchain4j.model.qianfan.client.embedding.EmbeddingResponse;
 import dev.langchain4j.model.qianfan.client.embedding.EmbeddingRequest;
+import dev.langchain4j.model.qianfan.client.embedding.EmbeddingResponse;
 import dev.langchain4j.model.qianfan.spi.QianfanEmbeddingModelBuilderFactory;
 import lombok.Builder;
+
+import java.net.Proxy;
 import java.util.List;
+
 import static dev.langchain4j.internal.RetryUtils.withRetry;
 import static dev.langchain4j.internal.Utils.getOrDefault;
-import static dev.langchain4j.model.qianfan.InternalQianfanHelper.*;
+import static dev.langchain4j.model.qianfan.InternalQianfanHelper.tokenUsageFrom;
 import static dev.langchain4j.spi.ServiceHelper.loadFactories;
 import static java.util.stream.Collectors.toList;
 /**
@@ -46,7 +49,8 @@ public class QianfanEmbeddingModel implements EmbeddingModel {
                                  String endpoint,
                                  String user,
                                  Boolean logRequests,
-                                 Boolean logResponses
+                                 Boolean logResponses,
+                                 Proxy proxy
                              ) {
         if (Utils.isNullOrBlank(apiKey)||Utils.isNullOrBlank(secretKey)) {
             throw new IllegalArgumentException(" api key and secret key must be defined. It can be generated here: https://console.bce.baidu.com/qianfan/ais/console/applicationConsole/application");
@@ -67,6 +71,7 @@ public class QianfanEmbeddingModel implements EmbeddingModel {
                 .secretKey(secretKey)
                 .logRequests(logRequests)
                 .logResponses(logResponses)
+                .proxy(proxy)
                 .build();
         this.maxRetries = getOrDefault(maxRetries, 3);
         this.user = user;

langchain4j-qianfan/src/main/java/dev/langchain4j/model/qianfan/QianfanLanguageModel.java

@@ -1,7 +1,6 @@
 package dev.langchain4j.model.qianfan;
 
 
-
 import dev.langchain4j.internal.Utils;
 import dev.langchain4j.model.language.LanguageModel;
 import dev.langchain4j.model.output.Response;
@@ -10,9 +9,13 @@ import dev.langchain4j.model.qianfan.client.completion.CompletionRequest;
 import dev.langchain4j.model.qianfan.client.completion.CompletionResponse;
 import dev.langchain4j.model.qianfan.spi.QianfanLanguageModelBuilderFactory;
 import lombok.Builder;
+
+import java.net.Proxy;
+
 import static dev.langchain4j.internal.RetryUtils.withRetry;
 import static dev.langchain4j.internal.Utils.getOrDefault;
-import static dev.langchain4j.model.qianfan.InternalQianfanHelper.*;
+import static dev.langchain4j.model.qianfan.InternalQianfanHelper.finishReasonFrom;
+import static dev.langchain4j.model.qianfan.InternalQianfanHelper.tokenUsageFrom;
 import static dev.langchain4j.spi.ServiceHelper.loadFactories;
 
 
@@ -51,7 +54,8 @@ public class QianfanLanguageModel implements LanguageModel {
                                 String endpoint,
                                 Double penaltyScore,
                                 Boolean logRequests,
-                                Boolean logResponses
+                                Boolean logResponses,
+                                Proxy proxy
                              ) {
         if (Utils.isNullOrBlank(apiKey)||Utils.isNullOrBlank(secretKey)) {
             throw new IllegalArgumentException(" api key and secret key must be defined. It can be generated here: https://console.bce.baidu.com/qianfan/ais/console/applicationConsole/application");
@@ -72,6 +76,7 @@ public class QianfanLanguageModel implements LanguageModel {
                 .secretKey(secretKey)
                 .logRequests(logRequests)
                 .logResponses(logResponses)
+                .proxy(proxy)
                 .build();
         this.temperature = getOrDefault(temperature, 0.7);
         this.maxRetries = getOrDefault(maxRetries, 3);

langchain4j-qianfan/src/main/java/dev/langchain4j/model/qianfan/QianfanStreamingChatModel.java

@@ -15,9 +15,12 @@ import dev.langchain4j.model.qianfan.client.chat.ChatCompletionRequest;
 import dev.langchain4j.model.qianfan.client.chat.ChatCompletionResponse;
 import dev.langchain4j.model.qianfan.spi.QianfanStreamingChatModelBuilderFactory;
 import lombok.Builder;
-import static dev.langchain4j.model.qianfan.InternalQianfanHelper.*;
+
+import java.net.Proxy;
 import java.util.List;
+
 import static dev.langchain4j.internal.Utils.getOrDefault;
+import static dev.langchain4j.model.qianfan.InternalQianfanHelper.getSystemMessage;
 import static dev.langchain4j.spi.ServiceHelper.loadFactories;
 
 /**
@@ -52,7 +55,8 @@ public class QianfanStreamingChatModel implements StreamingChatLanguageModel  {
                                      String responseFormat,
                                      Double penaltyScore,
                                      Boolean logRequests,
-                                     Boolean logResponses
+                                     Boolean logResponses,
+                                     Proxy proxy
                              ) {
         if (Utils.isNullOrBlank(apiKey)||Utils.isNullOrBlank(secretKey)) {
             throw new IllegalArgumentException(" api key and secret key must be defined. It can be generated here: https://console.bce.baidu.com/qianfan/ais/console/applicationConsole/application");
@@ -71,6 +75,7 @@ public class QianfanStreamingChatModel implements StreamingChatLanguageModel  {
                 .secretKey(secretKey)
                 .logRequests(logRequests)
                 .logStreamingResponses(logResponses)
+                .proxy(proxy)
                 .build();
         this.temperature = getOrDefault(temperature, 0.7);
         this.topP = topP;