HttpsURLConnection验证两次？

Question

我建立了一个安全的http连接，然后尝试从中获取PERCENTAGE OF TRAIN: 1.0 The reader log level is set to INFO Adding annotator pos Loading POS tagger from edu/stanford/nlp/models/pos-tagger/english-left3words/english-left3words-distsim.tagger ... done [0.8 sec]. Adding annotator lemma Adding annotator parse Loading parser from serialized file edu/stanford/nlp/models/lexparser/englishPCFG.ser.gz ... done [0.6 sec]. Jan 17, 2017 4:55:06 PM edu.stanford.nlp.ie.machinereading.MachineReading makeResultsPrinters INFO: Making result printers from Jan 17, 2017 4:55:06 PM edu.stanford.nlp.ie.machinereading.MachineReading makeResultsPrinters INFO: Making result printers from edu.stanford.nlp.ie.machinereading.RelationExtractorResultsPrinter Jan 17, 2017 4:55:06 PM edu.stanford.nlp.ie.machinereading.MachineReading makeResultsPrinters INFO: Making result printers from Jan 17, 2017 4:55:06 PM edu.stanford.nlp.ie.machinereading.MachineReading loadOrMakeSerializedSentences INFO: Parsing corpus sentences... Jan 17, 2017 4:55:06 PM edu.stanford.nlp.ie.machinereading.MachineReading loadOrMakeSerializedSentences INFO: These sentences will be serialized to /home/ubuntu/stanford-corenlp-full-2016-10-31/tmp/roth_sentences.ser Jan 17, 2017 4:55:06 PM edu.stanford.nlp.ie.machinereading.domains.roth.RothCONLL04Reader read INFO: Reading file: ../re-training-data.corp Jan 17, 2017 4:55:07 PM edu.stanford.nlp.ie.machinereading.GenericDataSetReader preProcessSentences SEVERE: GenericDataSetReader: Started pre-processing the corpus... Jan 17, 2017 4:55:07 PM edu.stanford.nlp.ie.machinereading.GenericDataSetReader preProcessSentences INFO: Annotating dataset with edu.stanford.nlp.pipeline.StanfordCoreNLP@5f9d02cb Jan 17, 2017 4:58:32 PM edu.stanford.nlp.ie.machinereading.GenericDataSetReader preProcessSentences SEVERE: GenericDataSetReader: Pre-processing complete. Jan 17, 2017 4:58:32 PM edu.stanford.nlp.ie.machinereading.GenericDataSetReader parse SEVERE: Changing NER tags using the CoreNLP pipeline. Replacing old annotator "parse" with signature [edu.stanford.nlp.pipeline.ParserAnnotator#parse.maxlen:100;#] with new annotator with signature [edu.stanford.nlp.pipeline.ParserAnnotator##] Adding annotator pos Adding annotator lemma Adding annotator ner Loading classifier from edu/stanford/nlp/models/ner/english.all.3class.distsim.crf.ser.gz ... done [1.4 sec]. Loading classifier from edu/stanford/nlp/models/ner/english.muc.7class.distsim.crf.ser.gz ... done [0.5 sec]. Loading classifier from edu/stanford/nlp/models/ner/english.conll.4class.distsim.crf.ser.gz ... done [0.5 sec]. Jan 17, 2017 4:58:45 PM edu.stanford.nlp.ie.machinereading.MachineReading loadOrMakeSerializedSentences INFO: Done. Parsed 1183 sentences. Jan 17, 2017 4:58:45 PM edu.stanford.nlp.ie.machinereading.MachineReading loadOrMakeSerializedSentences INFO: Serializing parsed sentences to /home/ubuntu/stanford-corenlp-full-2016-10-31/tmp/roth_sentences.ser... Exception in thread "main" java.io.FileNotFoundException: tmp/roth_sentences.ser (No such file or directory) at java.io.FileOutputStream.open0(Native Method) at java.io.FileOutputStream.open(FileOutputStream.java:270) at java.io.FileOutputStream.<init>(FileOutputStream.java:213) at edu.stanford.nlp.io.IOUtils.writeObjectToFile(IOUtils.java:77) at edu.stanford.nlp.io.IOUtils.writeObjectToFile(IOUtils.java:63) at edu.stanford.nlp.ie.machinereading.MachineReading.loadOrMakeSerializedSentences(MachineReading.java:914) at edu.stanford.nlp.ie.machinereading.MachineReading.run(MachineReading.java:270) at edu.stanford.nlp.ie.machinereading.MachineReading.main(MachineReading.java:111 。连接发生，我能够获取数据，但我实际上是向服务器发送两个授权请求？这是我的代码，它获取连接并建立输入流：

InputStream

在调用someConnection = (HttpsURLConnection) url.openConnection(); String userPass = username + ":" + password; String basicAuth = "Basic" + new String(new Base64().encode(userPass.getBytes())); someConnection.setRequestProperty("Authorization", basicAuth); if (header != null) someConnection.setRequestProperty(header, headerValue); InputStream is = someConnection.getInputStream(); 方法之前没有流量。然后我看到两个授权请求：

为什么会这样做？由于某种原因，第一个请求似乎失败了。

Answer 1

“Basic”和base64编码数据之间应该有空格。

如果没有这个，Authorization标头是错误的。我猜你在第一次请求时收到401并发送下一个可能从不同来源获得的其他凭证（JAAS？）。

Answer 2

标题expect的值与预期格式不匹配，应为Authorization后跟"Basic "编码为{64}的Base {64}变体（关于Basic access authentication的更多细节）。

在这里，您忘记在${username}:${password}之后添加尾随空格，以便永远不会正确执行身份验证，从而导致此意外行为。